Attachment 226927 Details for Bug 130318 – Patch

[patch] Patch

bug-130318-20140317092823.patch (text/plain), 108.54 KB, created by Darin Adler on 2014-03-17 09:28:45 PDT

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Creator: Darin Adler

Created: 2014-03-17 09:28:45 PDT

Size: 108.54 KB

patch

obsolete

>Subversion Revision: 165724
>diff --git a/Source/WTF/ChangeLog b/Source/WTF/ChangeLog
>index df6fa7328024f6b93aab86dcdad452dd2ba164bc..d63f18352eefe1f8674ecb5a8507b7ed14283a65 100644
>--- a/Source/WTF/ChangeLog
>+++ b/Source/WTF/ChangeLog
>@@ -1,3 +1,13 @@
>+2014-03-17  Darin Adler  <darin@apple.com>
>+
>+        Reduce use of deprecatedCharacters in WebCore
>+        https://bugs.webkit.org/show_bug.cgi?id=130318
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * wtf/text/WTFString.h: Export another overload of charactersToFloat since it's used
>+        in WebCore now.
>+
> 2014-03-16  Darin Adler  <darin@apple.com>
> 
>         Remove most uses of deprecatedCharacter in WTF
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index 862685057b17fc06f533c56608e37aa0538ad135..6e0c5f58ba3c51bb916d74c140e062dbc28d6b46 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,5 +1,254 @@
> 2014-03-17  Darin Adler  <darin@apple.com>
> 
>+        Reduce use of deprecatedCharacters in WebCore
>+        https://bugs.webkit.org/show_bug.cgi?id=130318
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * Modules/indexeddb/IDBKeyPath.cpp:
>+        (WebCore::IDBKeyPathLexer::IDBKeyPathLexer): Use StringView for parsing.
>+        (WebCore::IDBKeyPathLexer::lex): Ditto.
>+        (WebCore::IDBKeyPathLexer::lexIdentifier): Ditto.
>+
>+        * Modules/indexeddb/leveldb/IDBLevelDBCoding.cpp:
>+        (WebCore::IDBLevelDBCoding::encodeString): Index directly into string instead of
>+        using deprecatedCharacters.
>+
>+        * Modules/websockets/ThreadableWebSocketChannelClientWrapper.cpp:
>+        (WebCore::ThreadableWebSocketChannelClientWrapper::setSubprotocol): Use
>+        StringView::getCharactersWithUpconvert.
>+        (WebCore::ThreadableWebSocketChannelClientWrapper::setExtensions): Ditto.
>+
>+        * accessibility/ios/WebAccessibilityObjectWrapperIOS.mm:
>+        (-[WebAccessibilityObjectWrapper arrayOfTextForTextMarkers:attributed:]):
>+        Use operator NSString * instead of explicitly creating an NSString.
>+
>+        * bindings/js/SerializedScriptValue.cpp:
>+        (WebCore::writeLittleEndianUInt16): Added.
>+        (WebCore::CloneSerializer::serialize): Added a separate code path for 8-bit strings.
>+        (WebCore::CloneSerializer::write): Ditto.
>+
>+        * bindings/objc/WebScriptObject.mm:
>+        (+[WebScriptObject _convertValueToObjcValue:JSC::originRootObject:rootObject:]):
>+        Use operator NSString * instead of explicitly creating an NSString.
>+
>+        * dom/Document.cpp:
>+        (WebCore::Document::parseQualifiedName): Index directly into string instead of
>+        using deprecatedCharacters.
>+        * editing/CompositeEditCommand.cpp:
>+        (WebCore::containsOnlyWhitespace): Ditto.
>+        * editing/SmartReplace.cpp:
>+        (WebCore::addAllCodePoints): Ditto.
>+        (WebCore::getSmartSet): Use StringView::upconvertedCharacters.
>+
>+        * editing/TextIterator.cpp:
>+        (WebCore::foldQuoteMarksAndSoftHyphens): Changed to return a value so it can be
>+        used in initialization rather than assignment.
>+        (WebCore::SearchBuffer::SearchBuffer): Use StringView::upconvertedCharacters.
>+
>+        * editing/TypingCommand.cpp:
>+        (WebCore::TypingCommand::insertText): Index directly into string instead of using
>+        deprecatedCharacters.
>+        * editing/VisiblePosition.cpp:
>+        (WebCore::VisiblePosition::characterAfter): Ditto.
>+        * editing/VisibleUnits.cpp:
>+        (WebCore::startOfParagraph): Ditto.
>+        (WebCore::endOfParagraph): Ditto.
>+
>+        * fileapi/WebKitBlobBuilder.cpp:
>+        (WebCore::BlobBuilder::append): Pass a StringView to TextEncoding::encode.
>+
>+        * html/BaseDateAndTimeInputType.cpp:
>+        (WebCore::BaseDateAndTimeInputType::parseToDateComponents): Use
>+        StringView::upconvertedCharacters.
>+
>+        * html/FormDataList.cpp:
>+        (WebCore::FormDataList::appendString): Pass a StringView to TextEncoding::encode.
>+
>+        * html/canvas/CanvasRenderingContext2D.cpp:
>+        (WebCore::normalizeSpaces): Use StringView::getCharactersWithUpconvert.
>+
>+        * html/parser/HTMLParserIdioms.cpp:
>+        (WebCore::stripLeadingAndTrailingHTMLSpaces): Use characters16 for a code path
>+        that already handled 8-bit characters separately.
>+        (WebCore::parseHTMLNonNegativeInteger): Ditto.
>+        (WebCore::parseDescriptors): Added an 8-bit code path.
>+
>+        * inspector/InspectorStyleSheet.cpp:
>+        (WebCore::InspectorStyle::newLineAndWhitespaceDelimiters): Index directly into
>+        string instead of using deprecatedCharacters.
>+        * inspector/InspectorStyleTextEditor.cpp:
>+        (WebCore::InspectorStyleTextEditor::insertProperty): Ditto.
>+        (WebCore::InspectorStyleTextEditor::internalReplaceProperty): Ditto.
>+
>+        * page/ContentSecurityPolicy.cpp:
>+        (WebCore::isSourceListNone): Use StringView::upconvertedCharacters.
>+        (WebCore::CSPSourceList::parse): Ditto.
>+        (WebCore::NonceDirective::parse): Ditto.
>+        (WebCore::MediaListDirective::parse): Ditto.
>+        (WebCore::CSPDirectiveList::parse): Ditto.
>+        (WebCore::CSPDirectiveList::parseReportURI): Ditto.
>+        (WebCore::CSPDirectiveList::parseReflectedXSS): Ditto.
>+        (WebCore::ContentSecurityPolicy::didReceiveHeader): Ditto.
>+
>+        * page/PageSerializer.cpp:
>+        (WebCore::PageSerializer::serializeFrame): Pass a StringView into
>+        TextEncoding::encode.
>+        (WebCore::PageSerializer::serializeCSSStyleSheet): Ditto.
>+
>+        * platform/Length.cpp:
>+        (WebCore::countCharacter): Index directly into string instead of using
>+        deprecatedCharacters. Also changed to take a StringImpl&.
>+        (WebCore::newCoordsArray): Ditto. Call countCharacter the new way, and
>+        use StringView::upconvertedCharacters.
>+        (WebCore::newLengthArray): Ditto.
>+
>+        * platform/LinkHash.cpp:
>+        (WebCore::visitedLinkHash): Use characters16 for the 16-bit path.
>+        Also removed unused visitedURL function.
>+        * platform/LinkHash.h: Removed unused visitedURL function.
>+
>+        * platform/SharedBuffer.cpp:
>+        (WebCore::utf8Buffer): Added an 8-bit code path.
>+        * platform/URL.cpp:
>+        (WebCore::URL::port): Ditto.
>+        (WebCore::encodeRelativeString): Use StringView to call TextEncoding::encode.
>+
>+        * platform/graphics/Color.cpp:
>+        (WebCore::Color::parseHexColor): Use characteres16 in the 16-bit path.
>+        (WebCore::Color::Color): Ditto.
>+
>+        * platform/graphics/StringTruncator.cpp:
>+        (WebCore::centerTruncateToBuffer): Use StringView::getCharactersWithUpconvert.
>+        (WebCore::rightTruncateToBuffer): Ditto.
>+        (WebCore::rightClipToCharacterBuffer): Ditto.
>+        (WebCore::rightClipToWordBuffer): Ditto.
>+        (WebCore::leftTruncateToBuffer): Ditto.
>+        (WebCore::truncateString): Ditto.
>+
>+        * platform/graphics/TextRun.h:
>+        (WebCore::TextRun::TextRun): Use characters16 in the 16-bit code path.
>+
>+        * platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:
>+        (WebCore::MediaPlayerPrivateAVFoundationObjC::shouldWaitForLoadingOfResource):
>+        Use StringView::upconvertedCharacters.
>+
>+        * platform/network/FormDataBuilder.cpp:
>+        (WebCore::FormDataBuilder::addFilenameToMultiPartHeader): Use StrinView to call
>+        TextEncoding::encode.
>+
>+        * platform/sql/SQLiteStatement.cpp:
>+        (WebCore::SQLiteStatement::bindBlob): Use StringView::upconvertedCharacters.
>+        (WebCore::SQLiteStatement::bindText): Ditto.
>+
>+        * platform/text/DecodeEscapeSequences.h:
>+        (WebCore::Unicode16BitEscapeSequence::decodeRun): Changed to take a StringView.
>+        (WebCore::URLEscapeSequence::decodeRun): Ditto.
>+        (WebCore::decodeEscapeSequences): Pass StringView to decodeRun.
>+
>+        * platform/text/Hyphenation.cpp:
>+        (WebCore::lastHyphenLocation): Take a StringView.
>+        * platform/text/Hyphenation.h: Make lastHyphenLocation take a StringView.
>+
>+        * platform/text/TextBreakIterator.cpp:
>+        (WebCore::initializeIteratorWithRules): Use StringView::upconvertedCharacters.
>+
>+        * platform/text/TextEncoding.cpp:
>+        (WebCore::TextEncoding::encode): Use StringView::upconvertedCharacters.
>+        Change argument type to StringView.
>+        * platform/text/TextEncoding.h: Ditto.
>+
>+        * platform/text/TextEncodingRegistry.cpp:
>+        (WebCore::atomicCanonicalTextEncodingName): Use characters16 for the 16-bit path.
>+
>+        * platform/text/cf/HyphenationCF.cpp:
>+        (WebCore::lastHyphenLocation): Use StringView::text.createCFStringWithoutCopying.
>+        Change argument type to StringView.
>+
>+        * rendering/RenderBlock.cpp:
>+        (WebCore::RenderBlock::constructTextRun): Use characters16 for the 16-bit path.
>+
>+        * rendering/RenderCombineText.cpp:
>+        (WebCore::RenderCombineText::width): Removed check for null characters pointer,
>+        since the pointer will never be null, and even if it was there would be no need
>+        for an early exit.
>+
>+        * rendering/RenderText.cpp:
>+        (WebCore::maxWordFragmentWidth): Take a StringView.
>+        (WebCore::RenderText::computePreferredLogicalWidths): Pass in a StringView.
>+        * rendering/line/BreakingContextInlineHeaders.h:
>+        (WebCore::tryHyphenating): Ditto.
>+
>+        * rendering/svg/SVGTextLayoutEngine.cpp:
>+        (WebCore::SVGTextLayoutEngine::layoutTextOnLineOrPath): Use
>+        StringView::upconvertedCharacters.
>+
>+        * rendering/svg/SVGTextMetrics.cpp:
>+        (WebCore::SVGTextMetrics::SVGTextMetrics): Use String::substring.
>+
>+        * svg/SVGAngle.cpp:
>+        (WebCore::SVGAngle::setValueAsString): Use StringView::upconvertedCharacters.
>+        * svg/SVGAnimateMotionElement.cpp:
>+        (WebCore::parsePoint): Ditto.
>+        * svg/SVGAnimationElement.cpp:
>+        (WebCore::parseKeySplines): Ditto.
>+        * svg/SVGFitToViewBox.cpp:
>+        (WebCore::SVGFitToViewBox::parseViewBox): Ditto.
>+
>+        * svg/SVGFontData.cpp:
>+        (WebCore::SVGFontData::applySVGGlyphSelection): Pass StringView to
>+        createStringWIthMirroredCharacters.
>+        (WebCore::createStringWithMirroredCharacters): Changed to use StringView and
>+        use indexing into that instead of a characters pointer.
>+
>+        * svg/SVGFontData.h: Removed createStringWithMirroredCharacters member function,
>+        since it has nothing to do with the SVGFontData object. Now it's just a private
>+        helper function in the SVGFontData.cpp source file.
>+
>+        * svg/SVGFontElement.cpp:
>+        (WebCore::SVGFontElement::registerLigaturesInGlyphCache): Index into the string
>+        instead of using deprecatedCharacters.
>+
>+        * svg/SVGGlyphMap.h:
>+        (WebCore::SVGGlyphMap::addGlyph): Use StringView::upconvertedCharacters.
>+        (WebCore::SVGGlyphMap::collectGlyphsForString): Ditto.
>+        * svg/SVGGlyphRefElement.cpp:
>+        (WebCore::SVGGlyphRefElement::parseAttribute): Ditto.
>+        * svg/SVGLength.cpp:
>+        (WebCore::SVGLength::setValueAsString): Ditto.
>+        * svg/SVGLengthList.cpp:
>+        (WebCore::SVGLengthList::parse): Ditto.
>+        * svg/SVGNumberList.cpp:
>+        (WebCore::SVGNumberList::parse): Ditto.
>+        * svg/SVGParserUtilities.cpp:
>+        (WebCore::parseNumberFromString): Ditto.
>+        (WebCore::parseNumberOptionalNumber): Ditto.
>+        (WebCore::parseRect): Ditto.
>+        (WebCore::pointsListFromSVGData): Ditto.
>+        (WebCore::parseGlyphName): Ditto.
>+        (WebCore::parseKerningUnicodeString): Ditto.
>+        (WebCore::parseDelimitedString): Ditto.
>+        * svg/SVGPreserveAspectRatio.cpp:
>+        (WebCore::SVGPreserveAspectRatio::parse): Ditto.
>+        * svg/SVGStringList.cpp:
>+        (WebCore::SVGStringList::parse): Ditto.
>+        * svg/SVGTransformList.cpp:
>+        (WebCore::SVGTransformList::parse): Ditto.
>+        * svg/SVGTransformable.cpp:
>+        (WebCore::SVGTransformable::parseTransformType): Ditto.
>+        * svg/SVGViewSpec.cpp:
>+        (WebCore::SVGViewSpec::parseViewSpec): Ditto.
>+        * svg/SVGZoomAndPan.h:
>+        (WebCore::SVGZoomAndPan::parseAttribute): Ditto.
>+
>+        * xml/XMLHttpRequest.cpp:
>+        (WebCore::XMLHttpRequest::send): Pass a StringView to TextEncoding::encode.
>+
>+        * xml/XSLStyleSheetLibxslt.cpp:
>+        (WebCore::XSLStyleSheet::parseString): Use StringView::upconvertedCharacters.
>+
>+2014-03-17  Darin Adler  <darin@apple.com>
>+
>         Stop using deprecatedCharacters in HTMLTreeBuilder
>         https://bugs.webkit.org/show_bug.cgi?id=130323
> 
>diff --git a/Source/WTF/wtf/text/WTFString.h b/Source/WTF/wtf/text/WTFString.h
>index f329fe5c09f955d509d5ef0d921e01df7eb20a17..4441573ce1bef1653304878015d8ef0f76ee2e04 100644
>--- a/Source/WTF/wtf/text/WTFString.h
>+++ b/Source/WTF/wtf/text/WTFString.h
>@@ -66,7 +66,7 @@ intptr_t charactersToIntPtr(const UChar*, size_t, bool* ok = 0); // ignores trai
> // It would be better if these were more consistent with the above functions instead.
> WTF_EXPORT_STRING_API double charactersToDouble(const LChar*, size_t, bool* ok = 0);
> WTF_EXPORT_STRING_API double charactersToDouble(const UChar*, size_t, bool* ok = 0);
>-float charactersToFloat(const LChar*, size_t, bool* ok = 0);
>+WTF_EXPORT_STRING_API float charactersToFloat(const LChar*, size_t, bool* ok = 0);
> WTF_EXPORT_STRING_API float charactersToFloat(const UChar*, size_t, bool* ok = 0);
> WTF_EXPORT_STRING_API float charactersToFloat(const LChar*, size_t, size_t& parsedLength);
> WTF_EXPORT_STRING_API float charactersToFloat(const UChar*, size_t, size_t& parsedLength);
>diff --git a/Source/WebCore/Modules/indexeddb/IDBKeyPath.cpp b/Source/WebCore/Modules/indexeddb/IDBKeyPath.cpp
>index d93c0af10f108d3e5e61325f6c828c003180f1cc..85ea97606c1faca7f73d4d0880b938afe6a366d5 100644
>--- a/Source/WebCore/Modules/indexeddb/IDBKeyPath.cpp
>+++ b/Source/WebCore/Modules/indexeddb/IDBKeyPath.cpp
>@@ -45,8 +45,7 @@ public:
> 
>     explicit IDBKeyPathLexer(const String& s)
>         : m_string(s)
>-        , m_ptr(s.deprecatedCharacters())
>-        , m_end(s.deprecatedCharacters() + s.length())
>+        , m_remainingText(s)
>         , m_currentTokenType(TokenError)
>     {
>     }
>@@ -64,23 +63,23 @@ public:
> private:
>     TokenType lex(String&);
>     TokenType lexIdentifier(String&);
>+
>     String m_currentElement;
>-    String m_string;
>-    const UChar* m_ptr;
>-    const UChar* m_end;
>+    const String m_string;
>+    StringView m_remainingText;
>     TokenType m_currentTokenType;
> };
> 
> IDBKeyPathLexer::TokenType IDBKeyPathLexer::lex(String& element)
> {
>-    if (m_ptr >= m_end)
>+    if (m_remainingText.isEmpty())
>         return TokenEnd;
>-    ASSERT_WITH_SECURITY_IMPLICATION(m_ptr < m_end);
> 
>-    if (*m_ptr == '.') {
>-        ++m_ptr;
>+    if (m_remainingText[0] == '.') {
>+        m_remainingText = m_remainingText.substring(1);
>         return TokenDot;
>     }
>+
>     return lexIdentifier(element);
> }
> 
>@@ -108,16 +107,16 @@ static inline bool isIdentifierCharacter(UChar c)
> 
> IDBKeyPathLexer::TokenType IDBKeyPathLexer::lexIdentifier(String& element)
> {
>-    const UChar* start = m_ptr;
>-    if (m_ptr < m_end && isIdentifierStartCharacter(*m_ptr))
>-        ++m_ptr;
>+    StringView start = m_remainingText;
>+    if (!m_remainingText.isEmpty() && isIdentifierStartCharacter(m_remainingText[0]))
>+        m_remainingText = m_remainingText.substring(1);
>     else
>         return TokenError;
> 
>-    while (m_ptr < m_end && isIdentifierCharacter(*m_ptr))
>-        ++m_ptr;
>+    while (!m_remainingText.isEmpty() && isIdentifierCharacter(m_remainingText[0]))
>+        m_remainingText = m_remainingText.substring(1);
> 
>-    element = String(start, m_ptr - start);
>+    element = start.substring(0, start.length() - m_remainingText.length()).toString();
>     return TokenIdentifier;
> }
> 
>diff --git a/Source/WebCore/Modules/indexeddb/leveldb/IDBLevelDBCoding.cpp b/Source/WebCore/Modules/indexeddb/leveldb/IDBLevelDBCoding.cpp
>index 86e9fae6d47c2936e7cf1967839585f91ce85147..33606d05be3569ef50aeb3e00a6cf2c92befce37 100644
>--- a/Source/WebCore/Modules/indexeddb/leveldb/IDBLevelDBCoding.cpp
>+++ b/Source/WebCore/Modules/indexeddb/leveldb/IDBLevelDBCoding.cpp
>@@ -297,10 +297,9 @@ Vector<char> encodeString(const String& s)
>     size_t length = s.length();
>     Vector<char> ret(length * sizeof(UChar));
> 
>-    const UChar* src = s.deprecatedCharacters();
>     UChar* dst = reinterpret_cast<UChar*>(ret.data());
>     for (unsigned i = 0; i < length; ++i)
>-        *dst++ = htons(*src++);
>+        *dst++ = htons(s[i]);
> 
>     return ret;
> }
>diff --git a/Source/WebCore/Modules/websockets/ThreadableWebSocketChannelClientWrapper.cpp b/Source/WebCore/Modules/websockets/ThreadableWebSocketChannelClientWrapper.cpp
>index 0ab3c5eb1e40202b4d5a9543939cac4273c2e6b3..52e1d6f5d292039a8b23110052e9672d59ce0717 100644
>--- a/Source/WebCore/Modules/websockets/ThreadableWebSocketChannelClientWrapper.cpp
>+++ b/Source/WebCore/Modules/websockets/ThreadableWebSocketChannelClientWrapper.cpp
>@@ -38,6 +38,7 @@
> #include "WebSocketChannelClient.h"
> #include <wtf/PassRefPtr.h>
> #include <wtf/RefPtr.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -110,8 +111,7 @@ void ThreadableWebSocketChannelClientWrapper::setSubprotocol(const String& subpr
> {
>     unsigned length = subprotocol.length();
>     m_subprotocol.resize(length);
>-    if (length)
>-        memcpy(m_subprotocol.data(), subprotocol.deprecatedCharacters(), sizeof(UChar) * length);
>+    StringView(subprotocol).getCharactersWithUpconvert(m_subprotocol.data());
> }
> 
> String ThreadableWebSocketChannelClientWrapper::extensions() const
>@@ -125,8 +125,7 @@ void ThreadableWebSocketChannelClientWrapper::setExtensions(const String& extens
> {
>     unsigned length = extensions.length();
>     m_extensions.resize(length);
>-    if (length)
>-        memcpy(m_extensions.data(), extensions.deprecatedCharacters(), sizeof(UChar) * length);
>+    StringView(extensions).getCharactersWithUpconvert(m_extensions.data());
> }
> 
> ThreadableWebSocketChannel::SendResult ThreadableWebSocketChannelClientWrapper::sendRequestResult() const
>diff --git a/Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm b/Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm
>index 8bfd197d81f5c6c6208fd6a00bd9771230c291b0..7ffbb443fd1aa2c3e1453faaed09c7cc7b30b8c4 100644
>--- a/Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm
>+++ b/Source/WebCore/accessibility/ios/WebAccessibilityObjectWrapperIOS.mm
>@@ -1660,7 +1660,7 @@ - (NSArray *)arrayOfTextForTextMarkers:(NSArray *)markers attributed:(BOOL)attri
>                 String listMarkerText = m_object->listMarkerTextForNodeAndPosition(node, VisiblePosition(it.range()->startPosition())); 
>                 
>                 if (!listMarkerText.isEmpty()) 
>-                    [array addObject:[NSString stringWithCharacters:listMarkerText.deprecatedCharacters() length:listMarkerText.length()]];
>+                    [array addObject:listMarkerText];
>                 // There was not an element representation, so just return the text.
>                 [array addObject:it.text().createNSString().get()];
>             }
>diff --git a/Source/WebCore/bindings/js/SerializedScriptValue.cpp b/Source/WebCore/bindings/js/SerializedScriptValue.cpp
>index 7de2c5271fbd8a383cc78d52d26cfcdbe8105675..2d18b80106abee29adf61696e651d31d92f25dcd 100644
>--- a/Source/WebCore/bindings/js/SerializedScriptValue.cpp
>+++ b/Source/WebCore/bindings/js/SerializedScriptValue.cpp
>@@ -447,6 +447,19 @@ template <typename T> static bool writeLittleEndian(Vector<uint8_t>& buffer, con
>     return true;
> }
> 
>+static bool writeLittleEndianUInt16(Vector<uint8_t>& buffer, const LChar* values, uint32_t length)
>+{
>+    if (length > std::numeric_limits<uint32_t>::max() / 2)
>+        return false;
>+
>+    for (unsigned i = 0; i < length; ++i) {
>+        buffer.append(values[i]);
>+        buffer.append(0);
>+    }
>+
>+    return true;
>+}
>+
> template <> bool writeLittleEndian<uint8_t>(Vector<uint8_t>& buffer, const uint8_t* values, uint32_t length)
> {
>     buffer.append(values, length);
>@@ -472,7 +485,9 @@ public:
>         }
>         writeLittleEndian<uint8_t>(out, StringTag);
>         writeLittleEndian(out, s.length());
>-        return writeLittleEndian(out, s.impl()->deprecatedCharacters(), s.length());
>+        if (s.is8Bit())
>+            return writeLittleEndianUInt16(out, s.characters8(), s.length());
>+        return writeLittleEndian(out, s.characters16(), s.length());
>     }
> 
>     static void serializeUndefined(Vector<uint8_t>& out)
>@@ -969,21 +984,28 @@ private:
>             return;
>         }
> 
>+        unsigned length = str.length();
>+
>         // This condition is unlikely to happen as they would imply an ~8gb
>         // string but we should guard against it anyway
>-        if (str.length() >= StringPoolTag) {
>+        if (length >= StringPoolTag) {
>             fail();
>             return;
>         }
> 
>         // Guard against overflow
>-        if (str.length() > (std::numeric_limits<uint32_t>::max() - sizeof(uint32_t)) / sizeof(UChar)) {
>+        if (length > (std::numeric_limits<uint32_t>::max() - sizeof(uint32_t)) / sizeof(UChar)) {
>             fail();
>             return;
>         }
> 
>-        writeLittleEndian<uint32_t>(m_buffer, str.length());
>-        if (!writeLittleEndian<uint16_t>(m_buffer, reinterpret_cast<const uint16_t*>(str.deprecatedCharacters()), str.length()))
>+        writeLittleEndian<uint32_t>(m_buffer, length);
>+        if (!length || str.is8Bit()) {
>+            if (!writeLittleEndianUInt16(m_buffer, str.characters8(), length))
>+                fail();
>+            return;
>+        }
>+        if (!writeLittleEndian(m_buffer, str.characters16(), length))
>             fail();
>     }
> 
>diff --git a/Source/WebCore/bindings/objc/WebScriptObject.mm b/Source/WebCore/bindings/objc/WebScriptObject.mm
>index 58c7adea7c263c149703a6b5eb749a5fafcd0020..0427cb6a92fc768d14613814fa45efd37ed79e38 100644
>--- a/Source/WebCore/bindings/objc/WebScriptObject.mm
>+++ b/Source/WebCore/bindings/objc/WebScriptObject.mm
>@@ -546,11 +546,8 @@ + (id)_convertValueToObjcValue:(JSC::JSValue)value originRootObject:(RootObject*
>         return [WebScriptObject scriptObjectForJSObject:toRef(object) originRootObject:originRootObject rootObject:rootObject];
>     }
> 
>-    if (value.isString()) {
>-        ExecState* exec = rootObject->globalObject()->globalExec();
>-        const String& u = asString(value)->value(exec);
>-        return [NSString stringWithCharacters:u.deprecatedCharacters() length:u.length()];
>-    }
>+    if (value.isString())
>+        return asString(value)->value(rootObject->globalObject()->globalExec());
> 
>     if (value.isNumber())
>         return [NSNumber numberWithDouble:value.asNumber()];
>diff --git a/Source/WebCore/dom/Document.cpp b/Source/WebCore/dom/Document.cpp
>index dde6c3b6279519a5a01f00737283a52c13420661..9ecc32c39c043971495de58ad59f492a30cce244 100644
>--- a/Source/WebCore/dom/Document.cpp
>+++ b/Source/WebCore/dom/Document.cpp
>@@ -3972,10 +3972,9 @@ bool Document::parseQualifiedName(const String& qualifiedName, String& prefix, S
>     bool sawColon = false;
>     int colonPos = 0;
> 
>-    const UChar* s = qualifiedName.deprecatedCharacters();
>     for (unsigned i = 0; i < length;) {
>         UChar32 c;
>-        U16_NEXT(s, i, length, c)
>+        U16_NEXT(qualifiedName, i, length, c)
>         if (c == ':') {
>             if (sawColon) {
>                 ec = NAMESPACE_ERR;
>diff --git a/Source/WebCore/editing/CompositeEditCommand.cpp b/Source/WebCore/editing/CompositeEditCommand.cpp
>index 5ce2fc0719ff9eae31118a0ee3d542c52a8999a5..304c22d768987e781050472cd66707518278e9b4 100644
>--- a/Source/WebCore/editing/CompositeEditCommand.cpp
>+++ b/Source/WebCore/editing/CompositeEditCommand.cpp
>@@ -667,7 +667,7 @@ void CompositeEditCommand::setNodeAttribute(PassRefPtr<Element> element, const Q
> static inline bool containsOnlyWhitespace(const String& text)
> {
>     for (unsigned i = 0; i < text.length(); ++i) {
>-        if (!isWhitespace(text.deprecatedCharacters()[i]))
>+        if (!isWhitespace(text[i]))
>             return false;
>     }
>     
>diff --git a/Source/WebCore/editing/SmartReplace.cpp b/Source/WebCore/editing/SmartReplace.cpp
>index 2b044e3ee3c623e7e85a0b9e592f0f38d6859200..4c9958c05ca41408bfccb48ef077b180a8292495 100644
>--- a/Source/WebCore/editing/SmartReplace.cpp
>+++ b/Source/WebCore/editing/SmartReplace.cpp
>@@ -40,9 +40,8 @@ namespace WebCore {
> 
> static void addAllCodePoints(USet* smartSet, const String& string)
> {
>-    const UChar* characters = string.deprecatedCharacters();
>     for (size_t i = 0; i < string.length(); i++)
>-        uset_add(smartSet, characters[i]);
>+        uset_add(smartSet, string[i]);
> }
> 
> // This is mostly a port of the code in WebCore/editing/SmartReplaceCF.cpp
>@@ -56,7 +55,7 @@ static USet* getSmartSet(bool isPreviousCharacter)
>         // Whitespace and newline (kCFCharacterSetWhitespaceAndNewline)
>         UErrorCode ec = U_ZERO_ERROR;
>         String whitespaceAndNewline = ASCIILiteral("[[:WSpace:] [\\u000A\\u000B\\u000C\\u000D\\u0085]]");
>-        smartSet = uset_openPattern(whitespaceAndNewline.deprecatedCharacters(), whitespaceAndNewline.length(), &ec);
>+        smartSet = uset_openPattern(StringView(whitespaceAndNewline).upconvertedCharacters(), whitespaceAndNewline.length(), &ec);
>         ASSERT(U_SUCCESS(ec));
> 
>         // CJK ranges
>@@ -83,7 +82,7 @@ static USet* getSmartSet(bool isPreviousCharacter)
>             // Punctuation (kCFCharacterSetPunctuation)
>             UErrorCode ec = U_ZERO_ERROR;
>             String punctuationClass = ASCIILiteral("[:P:]");
>-            USet* icuPunct = uset_openPattern(punctuationClass.deprecatedCharacters(), punctuationClass.length(), &ec);
>+            USet* icuPunct = uset_openPattern(StringView(punctuationClass).upconvertedCharacters(), punctuationClass.length(), &ec);
>             ASSERT(U_SUCCESS(ec));
>             uset_addAll(smartSet, icuPunct);
>             uset_close(icuPunct);
>diff --git a/Source/WebCore/editing/TextIterator.cpp b/Source/WebCore/editing/TextIterator.cpp
>index 4dd2e93ac66c9e701cac65f7a88bf0386a574824..77ff794bdfde40fb12f9d1bdee57578387e3141b 100644
>--- a/Source/WebCore/editing/TextIterator.cpp
>+++ b/Source/WebCore/editing/TextIterator.cpp
>@@ -92,7 +92,8 @@ private:
>     bool isBadMatch(const UChar*, size_t length) const;
>     bool isWordStartMatch(size_t start, size_t length) const;
> 
>-    String m_target;
>+    const String m_target;
>+    const StringView::UpconvertedCharacters m_targetCharacters;
>     FindOptions m_options;
> 
>     Vector<UChar> m_buffer;
>@@ -101,7 +102,7 @@ private:
>     bool m_atBreak;
>     bool m_needsMoreContext;
> 
>-    bool m_targetRequiresKanaWorkaround;
>+    const bool m_targetRequiresKanaWorkaround;
>     Vector<UChar> m_normalizedTarget;
>     mutable Vector<UChar> m_normalizedMatch;
> 
>@@ -1649,17 +1650,22 @@ static inline UChar foldQuoteMarkOrSoftHyphen(UChar c)
>     }
> }
> 
>-static inline void foldQuoteMarksAndSoftHyphens(String& s)
>+// FIXME: We'd like to tailor the searcher to fold quote marks for us instead
>+// of doing it in a separate replacement pass here, but ICU doesn't offer a way
>+// to add tailoring on top of the locale-specific tailoring as of this writing.
>+static inline String foldQuoteMarksAndSoftHyphens(String string)
> {
>-    s.replace(hebrewPunctuationGeresh, '\'');
>-    s.replace(hebrewPunctuationGershayim, '"');
>-    s.replace(leftDoubleQuotationMark, '"');
>-    s.replace(leftSingleQuotationMark, '\'');
>-    s.replace(rightDoubleQuotationMark, '"');
>-    s.replace(rightSingleQuotationMark, '\'');
>-    // Replace soft hyphen with an ignorable character so that their presence or absence will
>-    // not affect string comparison.
>-    s.replace(softHyphen, 0);
>+    string.replace(hebrewPunctuationGeresh, '\'');
>+    string.replace(hebrewPunctuationGershayim, '"');
>+    string.replace(leftDoubleQuotationMark, '"');
>+    string.replace(leftSingleQuotationMark, '\'');
>+    string.replace(rightDoubleQuotationMark, '"');
>+    string.replace(rightSingleQuotationMark, '\'');
>+
>+    // Replace soft hyphens with an ignorable character so that presence or absence will not affect string comparison.
>+    string.replace(softHyphen, 0);
>+
>+    return string;
> }
> 
> #if !UCONFIG_NO_COLLATION
>@@ -1943,7 +1949,8 @@ static inline bool isSeparator(UChar32 character)
> }
> 
> inline SearchBuffer::SearchBuffer(const String& target, FindOptions options)
>-    : m_target(target)
>+    : m_target(foldQuoteMarksAndSoftHyphens(target))
>+    , m_targetCharacters(StringView(m_target).upconvertedCharacters())
>     , m_options(options)
>     , m_prefixLength(0)
>     , m_atBreak(true)
>@@ -1952,11 +1959,6 @@ inline SearchBuffer::SearchBuffer(const String& target, FindOptions options)
> {
>     ASSERT(!m_target.isEmpty());
> 
>-    // FIXME: We'd like to tailor the searcher to fold quote marks for us instead
>-    // of doing it in a separate replacement pass here, but ICU doesn't offer a way
>-    // to add tailoring on top of the locale-specific tailoring as of this writing.
>-    foldQuoteMarksAndSoftHyphens(m_target);
>-
>     size_t targetLength = m_target.length();
>     m_buffer.reserveInitialCapacity(std::max(targetLength * 8, minimumSearchBufferSize));
>     m_overlap = m_buffer.capacity() / 4;
>@@ -2000,12 +2002,12 @@ inline SearchBuffer::SearchBuffer(const String& target, FindOptions options)
>     usearch_setAttribute(searcher, USEARCH_ELEMENT_COMPARISON, comparator, &status);
>     ASSERT(status == U_ZERO_ERROR);
> 
>-    usearch_setPattern(searcher, m_target.deprecatedCharacters(), targetLength, &status);
>+    usearch_setPattern(searcher, m_targetCharacters, targetLength, &status);
>     ASSERT(status == U_ZERO_ERROR);
> 
>     // The kana workaround requires a normalized copy of the target string.
>     if (m_targetRequiresKanaWorkaround)
>-        normalizeCharacters(m_target.deprecatedCharacters(), m_target.length(), m_normalizedTarget);
>+        normalizeCharacters(m_targetCharacters, targetLength, m_normalizedTarget);
> }
> 
> inline SearchBuffer::~SearchBuffer()
>diff --git a/Source/WebCore/editing/TypingCommand.cpp b/Source/WebCore/editing/TypingCommand.cpp
>index 3a6dba37279bdd05cb48f07c4e2171f40bbd8599..9329cdf39139bbbe293c79568da4b436694ea805 100644
>--- a/Source/WebCore/editing/TypingCommand.cpp
>+++ b/Source/WebCore/editing/TypingCommand.cpp
>@@ -155,7 +155,7 @@ void TypingCommand::insertText(Document& document, const String& text, Options o
>     ASSERT(frame);
> 
>     if (!text.isEmpty())
>-        frame->editor().updateMarkersForWordsAffectedByEditing(isSpaceOrNewline(text.deprecatedCharacters()[0]));
>+        frame->editor().updateMarkersForWordsAffectedByEditing(isSpaceOrNewline(text[0]));
>     
>     insertText(document, text, frame->selection().selection(), options, composition);
> }
>diff --git a/Source/WebCore/editing/VisiblePosition.cpp b/Source/WebCore/editing/VisiblePosition.cpp
>index 10ca164cbe2e4e82fb599757d0a7e4f31a75b025..fd8cc4dd774f6516f5f998a8133b193f9ad08aee 100644
>--- a/Source/WebCore/editing/VisiblePosition.cpp
>+++ b/Source/WebCore/editing/VisiblePosition.cpp
>@@ -590,8 +590,7 @@ UChar32 VisiblePosition::characterAfter() const
>         return 0;
> 
>     UChar32 ch;
>-    const UChar* characters = textNode->data().deprecatedCharacters();
>-    U16_NEXT(characters, offset, length, ch);
>+    U16_NEXT(textNode->data(), offset, length, ch);
>     return ch;
> }
> 
>diff --git a/Source/WebCore/editing/VisibleUnits.cpp b/Source/WebCore/editing/VisibleUnits.cpp
>index f9a3068773a4dcd821e9a2f9e663627d864c915e..6c0561b4f17934a4321de8004f413a4d04672c0c 100644
>--- a/Source/WebCore/editing/VisibleUnits.cpp
>+++ b/Source/WebCore/editing/VisibleUnits.cpp
>@@ -1155,13 +1155,13 @@ VisiblePosition startOfParagraph(const VisiblePosition& c, EditingBoundaryCrossi
>             ASSERT_WITH_SECURITY_IMPLICATION(n->isTextNode());
>             type = Position::PositionIsOffsetInAnchor;
>             if (style.preserveNewline()) {
>-                const UChar* chars = toRenderText(r)->deprecatedCharacters();
>-                int i = toRenderText(r)->textLength();
>+                StringImpl& text = *toRenderText(r)->text();
>+                int i = text.length();
>                 int o = offset;
>                 if (n == startNode && o < i)
>                     i = std::max(0, o);
>                 while (--i >= 0) {
>-                    if (chars[i] == '\n')
>+                    if (text[i] == '\n')
>                         return VisiblePosition(Position(toText(n), i + 1), DOWNSTREAM);
>                 }
>             }
>@@ -1236,13 +1236,13 @@ VisiblePosition endOfParagraph(const VisiblePosition& c, EditingBoundaryCrossing
>         // FIXME: We avoid returning a position where the renderer can't accept the caret.
>         if (r->isText() && toRenderText(r)->hasRenderedText()) {
>             ASSERT_WITH_SECURITY_IMPLICATION(n->isTextNode());
>-            int length = toRenderText(r)->textLength();
>             type = Position::PositionIsOffsetInAnchor;
>             if (style.preserveNewline()) {
>-                const UChar* chars = toRenderText(r)->deprecatedCharacters();
>+                StringImpl& text = *toRenderText(r)->text();
>                 int o = n == startNode ? offset : 0;
>+                int length = text.length();
>                 for (int i = o; i < length; ++i) {
>-                    if (chars[i] == '\n')
>+                    if (text[i] == '\n')
>                         return VisiblePosition(Position(toText(n), i), DOWNSTREAM);
>                 }
>             }
>diff --git a/Source/WebCore/fileapi/WebKitBlobBuilder.cpp b/Source/WebCore/fileapi/WebKitBlobBuilder.cpp
>index 8a458053f7f77dd6a7fcf9c877a1dbcd3c374747..658b6a45de56c450ef58427c68128a4a29124e3c 100644
>--- a/Source/WebCore/fileapi/WebKitBlobBuilder.cpp
>+++ b/Source/WebCore/fileapi/WebKitBlobBuilder.cpp
>@@ -44,6 +44,7 @@
> #include <wtf/Vector.h>
> #include <wtf/text/AtomicString.h>
> #include <wtf/text/CString.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -71,7 +72,7 @@ Vector<char>& BlobBuilder::getBuffer()
> 
> void BlobBuilder::append(const String& text, const String& endingType)
> {
>-    CString utf8Text = UTF8Encoding().encode(text.deprecatedCharacters(), text.length(), EntitiesForUnencodables);
>+    CString utf8Text = UTF8Encoding().encode(text, EntitiesForUnencodables);
> 
>     Vector<char>& buffer = getBuffer();
>     size_t oldSize = buffer.size();
>diff --git a/Source/WebCore/html/BaseDateAndTimeInputType.cpp b/Source/WebCore/html/BaseDateAndTimeInputType.cpp
>index bdcde185cdb2f475d129eaae48ef042e94e878fe..0ca7a34281c945a4350fca7cb1fcb8176f821351 100644
>--- a/Source/WebCore/html/BaseDateAndTimeInputType.cpp
>+++ b/Source/WebCore/html/BaseDateAndTimeInputType.cpp
>@@ -108,7 +108,7 @@ bool BaseDateAndTimeInputType::parseToDateComponents(const String& source, DateC
>     DateComponents ignoredResult;
>     if (!out)
>         out = &ignoredResult;
>-    return parseToDateComponentsInternal(source.deprecatedCharacters(), source.length(), out);
>+    return parseToDateComponentsInternal(source.upconvertedCharacters(), source.length(), out);
> }
> 
> String BaseDateAndTimeInputType::serialize(const Decimal& value) const
>diff --git a/Source/WebCore/html/FormDataList.cpp b/Source/WebCore/html/FormDataList.cpp
>index 48fc629693db1112cdaa24fd84b7148d90158474..136b6af7b50607b03e1a479bbdb5e47a7ee768b6 100644
>--- a/Source/WebCore/html/FormDataList.cpp
>+++ b/Source/WebCore/html/FormDataList.cpp
>@@ -22,6 +22,7 @@
> #include "FormDataList.h"
> 
> #include "LineEnding.h"
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -32,7 +33,7 @@ FormDataList::FormDataList(const TextEncoding& c)
> 
> void FormDataList::appendString(const String& s)
> {
>-    CString cstr = m_encoding.encode(s.deprecatedCharacters(), s.length(), EntitiesForUnencodables);
>+    CString cstr = m_encoding.encode(s, EntitiesForUnencodables);
>     m_items.append(normalizeLineEndingsToCRLF(cstr));
> }
> 
>diff --git a/Source/WebCore/html/canvas/CanvasRenderingContext2D.cpp b/Source/WebCore/html/canvas/CanvasRenderingContext2D.cpp
>index 9c119234f4df6e01969c485c03d7dc347102488c..47b8730a1642e090c2b5aa8061ea9dbbf7e7b9a9 100755
>--- a/Source/WebCore/html/canvas/CanvasRenderingContext2D.cpp
>+++ b/Source/WebCore/html/canvas/CanvasRenderingContext2D.cpp
>@@ -2167,7 +2167,7 @@ static void normalizeSpaces(String& text)
> 
>     unsigned textLength = text.length();
>     Vector<UChar> charVector(textLength);
>-    memcpy(charVector.data(), text.deprecatedCharacters(), textLength * sizeof(UChar));
>+    StringView(text).getCharactersWithUpconvert(charVector.data());
> 
>     charVector[i++] = ' ';
> 
>diff --git a/Source/WebCore/html/parser/HTMLParserIdioms.cpp b/Source/WebCore/html/parser/HTMLParserIdioms.cpp
>index 6c99b255fb7314c3c8b21c4f1ddd6c6154228d56..a2186b117b9e7f1ce52eaaee58ed70bf627d5143 100644
>--- a/Source/WebCore/html/parser/HTMLParserIdioms.cpp
>+++ b/Source/WebCore/html/parser/HTMLParserIdioms.cpp
>@@ -71,7 +71,7 @@ String stripLeadingAndTrailingHTMLSpaces(const String& string)
>     if (string.is8Bit())
>         return stripLeadingAndTrailingHTMLSpaces(string, string.characters8(), length);
> 
>-    return stripLeadingAndTrailingHTMLSpaces(string, string.deprecatedCharacters(), length);
>+    return stripLeadingAndTrailingHTMLSpaces(string, string.characters16(), length);
> }
> 
> String serializeForNumberType(const Decimal& number)
>@@ -267,12 +267,12 @@ bool parseHTMLNonNegativeInteger(const String& input, unsigned& value)
>     // Step 1
>     // Step 2
>     unsigned length = input.length();
>-    if (length && input.is8Bit()) {
>+    if (!length || input.is8Bit()) {
>         const LChar* start = input.characters8();
>         return parseHTMLNonNegativeIntegerInternal(start, start + length, value);
>     }
>     
>-    const UChar* start = input.deprecatedCharacters();
>+    const UChar* start = input.characters16();
>     return parseHTMLNonNegativeIntegerInternal(start, start + length, value);
> }
> 
>@@ -326,7 +326,10 @@ static bool parseDescriptors(const String& attribute, size_t start, size_t end,
>         if (isFoundScaleFactor)
>             return false;
> 
>-        imageScaleFactor = charactersToFloat(attribute.deprecatedCharacters() + descriptorStart, descriptorEnd - descriptorStart, &isValid);
>+        if (attribute.is8Bit())
>+            imageScaleFactor = charactersToFloat(attribute.characters8() + descriptorStart, descriptorEnd - descriptorStart, &isValid);
>+        else
>+            imageScaleFactor = charactersToFloat(attribute.characters16() + descriptorStart, descriptorEnd - descriptorStart, &isValid);
>         isFoundScaleFactor = true;
>     }
> 
>diff --git a/Source/WebCore/inspector/InspectorStyleSheet.cpp b/Source/WebCore/inspector/InspectorStyleSheet.cpp
>index c635c582189d0bf0052e17febc947a658b47060e..08776d7adce5fae715152694385c2404529f3838 100644
>--- a/Source/WebCore/inspector/InspectorStyleSheet.cpp
>+++ b/Source/WebCore/inspector/InspectorStyleSheet.cpp
>@@ -712,14 +712,13 @@ NewLineAndWhitespace& InspectorStyle::newLineAndWhitespaceDelimiters() const
>     int propertyIndex = 0;
>     bool isFullPrefixScanned = false;
>     bool lineFeedTerminated = false;
>-    const UChar* characters = text.deprecatedCharacters();
>     while (propertyIndex < propertyCount) {
>         const WebCore::CSSPropertySourceData& currentProperty = sourcePropertyData->at(propertyIndex++);
> 
>         bool processNextProperty = false;
>         int scanEnd = currentProperty.range.start;
>         for (int i = scanStart; i < scanEnd; ++i) {
>-            UChar ch = characters[i];
>+            UChar ch = text[i];
>             bool isLineFeed = isHTMLLineBreak(ch);
>             if (isLineFeed) {
>                 if (!lineFeedTerminated)
>diff --git a/Source/WebCore/inspector/InspectorStyleTextEditor.cpp b/Source/WebCore/inspector/InspectorStyleTextEditor.cpp
>index c17c3de41df5b65041b26fd4b31020e2989a9dd2..3ce5cb62e073d60755f98d0c98c0b6f0e2a93da3 100644
>--- a/Source/WebCore/inspector/InspectorStyleTextEditor.cpp
>+++ b/Source/WebCore/inspector/InspectorStyleTextEditor.cpp
>@@ -82,12 +82,10 @@ void InspectorStyleTextEditor::insertProperty(unsigned index, const String& prop
>     if (insertLast && !insertFirstInSource) {
>         propertyStart = styleBodyLength;
>         if (propertyStart && textToSet.length()) {
>-            const UChar* characters = m_styleText.deprecatedCharacters();
>-
>             long curPos = propertyStart - 1; // The last position of style declaration, since propertyStart points past one.
>-            while (curPos && isHTMLSpace(characters[curPos]))
>+            while (curPos && isHTMLSpace(m_styleText[curPos]))
>                 --curPos;
>-            if (curPos && characters[curPos] != ';') {
>+            if (curPos && m_styleText[curPos] != ';') {
>                 // Prepend a ";" to the property text if appending to a style declaration where
>                 // the last property has no trailing ";".
>                 textToSet.insert(";", 0);
>@@ -230,7 +228,6 @@ void InspectorStyleTextEditor::internalReplaceProperty(const InspectorStylePrope
>     const SourceRange& range = property.sourceData.range;
>     long replaceRangeStart = range.start;
>     long replaceRangeEnd = range.end;
>-    const UChar* characters = m_styleText.deprecatedCharacters();
>     long newTextLength = newText.length();
>     String finalNewText = newText;
> 
>@@ -241,14 +238,14 @@ void InspectorStyleTextEditor::internalReplaceProperty(const InspectorStylePrope
>         if (replaceRangeStart >= fullPrefixLength && m_styleText.substring(replaceRangeStart - fullPrefixLength, fullPrefixLength) == fullPrefix)
>             replaceRangeStart -= fullPrefixLength;
>     } else if (newTextLength) {
>-        if (isHTMLLineBreak(newText.deprecatedCharacters()[newTextLength - 1])) {
>+        if (isHTMLLineBreak(newText[newTextLength - 1])) {
>             // Coalesce newlines of the original and new property values (to avoid a lot of blank lines while incrementally applying property values).
>             bool foundNewline = false;
>             bool isLastNewline = false;
>             int i;
>             int textLength = m_styleText.length();
>-            for (i = replaceRangeEnd; i < textLength && isSpaceOrNewline(characters[i]); ++i) {
>-                isLastNewline = isHTMLLineBreak(characters[i]);
>+            for (i = replaceRangeEnd; i < textLength && isSpaceOrNewline(m_styleText[i]); ++i) {
>+                isLastNewline = isHTMLLineBreak(m_styleText[i]);
>                 if (isLastNewline)
>                     foundNewline = true;
>                 else if (foundNewline && !isLastNewline) {
>diff --git a/Source/WebCore/page/ContentSecurityPolicy.cpp b/Source/WebCore/page/ContentSecurityPolicy.cpp
>index 5a5a7f7a870c7307ac7ac528b3f94de24055e789..58d63679cf1d4d4e3b91494edce9b9ffc284d819 100644
>--- a/Source/WebCore/page/ContentSecurityPolicy.cpp
>+++ b/Source/WebCore/page/ContentSecurityPolicy.cpp
>@@ -189,8 +189,9 @@ static void skipWhile(const UChar*& position, const UChar* end)
> 
> static bool isSourceListNone(const String& value)
> {
>-    const UChar* begin = value.deprecatedCharacters();
>-    const UChar* end = value.deprecatedCharacters() + value.length();
>+    auto characters = StringView(value).upconvertedCharacters();
>+    const UChar* begin = characters;
>+    const UChar* end = characters + value.length();
>     skipWhile<isASCIISpace>(begin, end);
> 
>     const UChar* position = begin;
>@@ -339,7 +340,8 @@ void CSPSourceList::parse(const String& value)
>     // We represent 'none' as an empty m_list.
>     if (isSourceListNone(value))
>         return;
>-    parse(value.deprecatedCharacters(), value.deprecatedCharacters() + value.length());
>+    auto characters = StringView(value).upconvertedCharacters();
>+    parse(characters, characters + value.length());
> }
> 
> bool CSPSourceList::matches(const URL& url)
>@@ -680,7 +682,8 @@ private:
>     void parse(const String& value)
>     {
>         String nonce;
>-        const UChar* position = value.deprecatedCharacters();
>+        auto characters = StringView(value).upconvertedCharacters();
>+        const UChar* position = characters;
>         const UChar* end = position + value.length();
> 
>         skipWhile<isASCIISpace>(position, end);
>@@ -723,7 +726,8 @@ public:
> private:
>     void parse(const String& value)
>     {
>-        const UChar* begin = value.deprecatedCharacters();
>+        auto characters = StringView(value).upconvertedCharacters();
>+        const UChar* begin = characters;
>         const UChar* position = begin;
>         const UChar* end = begin + value.length();
> 
>@@ -1211,7 +1215,8 @@ void CSPDirectiveList::parse(const String& policy)
>     if (policy.isEmpty())
>         return;
> 
>-    const UChar* position = policy.deprecatedCharacters();
>+    auto characters = StringView(policy).upconvertedCharacters();
>+    const UChar* position = characters;
>     const UChar* end = position + policy.length();
> 
>     while (position < end) {
>@@ -1290,7 +1295,9 @@ void CSPDirectiveList::parseReportURI(const String& name, const String& value)
>         m_policy->reportDuplicateDirective(name);
>         return;
>     }
>-    const UChar* position = value.deprecatedCharacters();
>+
>+    auto characters = StringView(name).upconvertedCharacters();
>+    const UChar* position = characters;
>     const UChar* end = position + value.length();
> 
>     while (position < end) {
>@@ -1344,7 +1351,8 @@ void CSPDirectiveList::parseReflectedXSS(const String& name, const String& value
>         return;
>     }
> 
>-    const UChar* position = value.deprecatedCharacters();
>+    auto characters = StringView(value).upconvertedCharacters();
>+    const UChar* position = characters;
>     const UChar* end = position + value.length();
> 
>     skipWhile<isASCIISpace>(position, end);
>@@ -1443,7 +1451,8 @@ void ContentSecurityPolicy::didReceiveHeader(const String& header, HeaderType ty
>     // RFC2616, section 4.2 specifies that headers appearing multiple times can
>     // be combined with a comma. Walk the header string, and parse each comma
>     // separated chunk as a separate header.
>-    const UChar* begin = header.deprecatedCharacters();
>+    auto characters = StringView(header).upconvertedCharacters();
>+    const UChar* begin = characters;
>     const UChar* position = begin;
>     const UChar* end = begin + header.length();
>     while (position < end) {
>diff --git a/Source/WebCore/page/PageSerializer.cpp b/Source/WebCore/page/PageSerializer.cpp
>index b721a647de451011f6bd8c8183dc5b6095ecf477..c80259cf100f682808716683176203bb01e3d77f 100644
>--- a/Source/WebCore/page/PageSerializer.cpp
>+++ b/Source/WebCore/page/PageSerializer.cpp
>@@ -216,7 +216,7 @@ void PageSerializer::serializeFrame(Frame* frame)
>         return;
>     }
>     String text = accumulator.serializeNodes(*document->documentElement(), 0, IncludeNode);
>-    CString frameHTML = textEncoding.encode(text.deprecatedCharacters(), text.length(), EntitiesForUnencodables);
>+    CString frameHTML = textEncoding.encode(text, EntitiesForUnencodables);
>     m_resources->append(Resource(url, document->suggestedMIMEType(), SharedBuffer::create(frameHTML.data(), frameHTML.length())));
>     m_resourceURLs.add(url);
> 
>@@ -283,7 +283,7 @@ void PageSerializer::serializeCSSStyleSheet(CSSStyleSheet* styleSheet, const URL
>         TextEncoding textEncoding(styleSheet->contents().charset());
>         ASSERT(textEncoding.isValid());
>         String textString = cssText.toString();
>-        CString text = textEncoding.encode(textString.deprecatedCharacters(), textString.length(), EntitiesForUnencodables);
>+        CString text = textEncoding.encode(textString, EntitiesForUnencodables);
>         m_resources->append(Resource(url, String("text/css"), SharedBuffer::create(text.data(), text.length())));
>         m_resourceURLs.add(url);
>     }
>diff --git a/Source/WebCore/platform/Length.cpp b/Source/WebCore/platform/Length.cpp
>index dc0579f0cad433ac4112bdaf59a989cdbb7f0c9d..f8404b0c7f34f603d7f53f9da2c0d2f8fab5a1c2 100644
>--- a/Source/WebCore/platform/Length.cpp
>+++ b/Source/WebCore/platform/Length.cpp
>@@ -30,7 +30,7 @@
> #include <wtf/Assertions.h>
> #include <wtf/StdLibExtras.h>
> #include <wtf/text/StringBuffer.h>
>-#include <wtf/text/WTFString.h>
>+#include <wtf/text/StringView.h>
> 
> using namespace WTF;
> 
>@@ -77,21 +77,21 @@ static Length parseLength(const UChar* data, unsigned length)
>     return Length(0, Relative);
> }
> 
>-static int countCharacter(const UChar* data, unsigned length, UChar character)
>+static unsigned countCharacter(StringImpl& string, UChar character)
> {
>-    int count = 0;
>-    for (int i = 0; i < static_cast<int>(length); ++i)
>-        count += data[i] == character;
>+    unsigned count = 0;
>+    unsigned length = string.length();
>+    for (unsigned i = 0; i < length; ++i)
>+        count += string[i] == character;
>     return count;
> }
> 
> std::unique_ptr<Length[]> newCoordsArray(const String& string, int& len)
> {
>     unsigned length = string.length();
>-    const UChar* data = string.deprecatedCharacters();
>     StringBuffer<UChar> spacified(length);
>     for (unsigned i = 0; i < length; i++) {
>-        UChar cc = data[i];
>+        UChar cc = string[i];
>         if (cc > '9' || (cc < '0' && cc != '-' && cc != '*' && cc != '.'))
>             spacified[i] = ' ';
>         else
>@@ -101,18 +101,19 @@ std::unique_ptr<Length[]> newCoordsArray(const String& string, int& len)
> 
>     str = str->simplifyWhiteSpace();
> 
>-    len = countCharacter(str->deprecatedCharacters(), str->length(), ' ') + 1;
>+    len = countCharacter(*str, ' ') + 1;
>     auto r = std::make_unique<Length[]>(len);
> 
>     int i = 0;
>     unsigned pos = 0;
>     size_t pos2;
> 
>+    auto upconvertedCharacters = StringView(str.get()).upconvertedCharacters();
>     while ((pos2 = str->find(' ', pos)) != notFound) {
>-        r[i++] = parseLength(str->deprecatedCharacters() + pos, pos2 - pos);
>+        r[i++] = parseLength(upconvertedCharacters + pos, pos2 - pos);
>         pos = pos2+1;
>     }
>-    r[i] = parseLength(str->deprecatedCharacters() + pos, str->length() - pos);
>+    r[i] = parseLength(upconvertedCharacters + pos, str->length() - pos);
> 
>     ASSERT(i == len - 1);
> 
>@@ -127,15 +128,16 @@ std::unique_ptr<Length[]> newLengthArray(const String& string, int& len)
>         return nullptr;
>     }
> 
>-    len = countCharacter(str->deprecatedCharacters(), str->length(), ',') + 1;
>+    len = countCharacter(*str, ',') + 1;
>     auto r = std::make_unique<Length[]>(len);
> 
>     int i = 0;
>     unsigned pos = 0;
>     size_t pos2;
> 
>+    auto upconvertedCharacters = StringView(str.get()).upconvertedCharacters();
>     while ((pos2 = str->find(',', pos)) != notFound) {
>-        r[i++] = parseLength(str->deprecatedCharacters() + pos, pos2 - pos);
>+        r[i++] = parseLength(upconvertedCharacters + pos, pos2 - pos);
>         pos = pos2+1;
>     }
> 
>@@ -143,7 +145,7 @@ std::unique_ptr<Length[]> newLengthArray(const String& string, int& len)
> 
>     // IE Quirk: If the last comma is the last char skip it and reduce len by one.
>     if (str->length()-pos > 0)
>-        r[i] = parseLength(str->deprecatedCharacters() + pos, str->length() - pos);
>+        r[i] = parseLength(upconvertedCharacters + pos, str->length() - pos);
>     else
>         len--;
> 
>diff --git a/Source/WebCore/platform/LinkHash.cpp b/Source/WebCore/platform/LinkHash.cpp
>index 5f24b20c9d078e84e23e1233c34f596a023013d9..ece933faa5194124069e8f8383940c99c5377125 100644
>--- a/Source/WebCore/platform/LinkHash.cpp
>+++ b/Source/WebCore/platform/LinkHash.cpp
>@@ -214,10 +214,9 @@ static ALWAYS_INLINE LinkHash visitedLinkHashInline(const CharacterType* url, un
> LinkHash visitedLinkHash(const String& url)
> {
>     unsigned length = url.length();
>-
>-    if (length && url.is8Bit())
>+    if (!length || url.is8Bit())
>         return visitedLinkHashInline(url.characters8(), length);
>-    return visitedLinkHashInline(url.deprecatedCharacters(), length);
>+    return visitedLinkHashInline(url.characters16(), length);
> }
> 
> LinkHash visitedLinkHash(const UChar* url, unsigned length)
>@@ -284,11 +283,6 @@ static ALWAYS_INLINE void visitedURLInline(const URL& base, const CharacterType*
>     return;
> }
> 
>-void visitedURL(const URL& base, const AtomicString& attributeURL, Vector<UChar, 512>& buffer)
>-{
>-    return visitedURLInline(base, attributeURL.string().deprecatedCharacters(), attributeURL.length(), buffer);
>-}
>-
> LinkHash visitedLinkHash(const URL& base, const AtomicString& attributeURL)
> {
>     if (attributeURL.isEmpty())
>diff --git a/Source/WebCore/platform/LinkHash.h b/Source/WebCore/platform/LinkHash.h
>index 14fdbedef1ad028a304f86bfe10f591f38423a4e..039942f26276d6957746b2918f4fac313b633af5 100644
>--- a/Source/WebCore/platform/LinkHash.h
>+++ b/Source/WebCore/platform/LinkHash.h
>@@ -63,12 +63,6 @@ LinkHash visitedLinkHash(const UChar* url, unsigned length);
> // look like a relative URL.
> LinkHash visitedLinkHash(const URL& base, const AtomicString& attributeURL);
> 
>-// Resolves the potentially relative URL "attributeURL" relative to the given
>-// base URL, and returns the hash of the string that will be used for visited.
>-// It will return an empty Vector in case of errors.
>-void visitedURL(const URL& base, const AtomicString& attributeURL, Vector<UChar, 512>&);
>-
>-
> }  // namespace WebCore
> 
> #endif  // LinkHash_h
>diff --git a/Source/WebCore/platform/SharedBuffer.cpp b/Source/WebCore/platform/SharedBuffer.cpp
>index c70b4d2dcf8b0cf17b995782ddcf688a14f08749..c5ff23a0676db2a5ce69ea10f8152765f562ac3b 100644
>--- a/Source/WebCore/platform/SharedBuffer.cpp
>+++ b/Source/WebCore/platform/SharedBuffer.cpp
>@@ -522,10 +522,18 @@ PassRefPtr<SharedBuffer> utf8Buffer(const String& string)
> 
>     // Convert to runs of 8-bit characters.
>     char* p = buffer.data();
>-    const UChar* d = string.deprecatedCharacters();
>-    WTF::Unicode::ConversionResult result = WTF::Unicode::convertUTF16ToUTF8(&d, d + length, &p, p + buffer.size(), true);
>-    if (result != WTF::Unicode::conversionOK)
>-        return 0;
>+    WTF::Unicode::ConversionResult result;
>+    if (length) {
>+        if (string.is8Bit()) {
>+            const LChar* d = string.characters8();
>+            result = WTF::Unicode::convertLatin1ToUTF8(&d, d + length, &p, p + buffer.size());
>+        } else {
>+            const UChar* d = string.characters16();
>+            result = WTF::Unicode::convertUTF16ToUTF8(&d, d + length, &p, p + buffer.size(), true);
>+        }
>+        if (result != WTF::Unicode::conversionOK)
>+            return nullptr;
>+    }
> 
>     buffer.shrink(p - buffer.data());
>     return SharedBuffer::adoptVector(buffer);
>diff --git a/Source/WebCore/platform/URL.cpp b/Source/WebCore/platform/URL.cpp
>index 9469f1a8b48e28faefdda2a6d4eebf5dff4d2901..94dddcac14d2de5bf6901240bdddca723b4dd650 100644
>--- a/Source/WebCore/platform/URL.cpp
>+++ b/Source/WebCore/platform/URL.cpp
>@@ -588,7 +588,11 @@ unsigned short URL::port() const
>         return 0;
> 
>     bool ok = false;
>-    unsigned number = charactersToUIntStrict(m_string.deprecatedCharacters() + m_hostEnd + 1, m_portEnd - m_hostEnd - 1, &ok);
>+    unsigned number;
>+    if (m_string.is8Bit())
>+        number = charactersToUIntStrict(m_string.characters8() + m_hostEnd + 1, m_portEnd - m_hostEnd - 1, &ok);
>+    else
>+        number = charactersToUIntStrict(m_string.characters16() + m_hostEnd + 1, m_portEnd - m_hostEnd - 1, &ok);
>     if (!ok || number > maximumValidPortNumber)
>         return invalidPortNumber;
>     return number;
>@@ -1666,14 +1670,14 @@ static void encodeRelativeString(const String& rel, const TextEncoding& encoding
>     }
> 
>     if (pathEnd == -1) {
>-        CString decoded = pathEncoding.encode(s.data(), s.size(), URLEncodedEntitiesForUnencodables);
>+        CString decoded = pathEncoding.encode(StringView(s.data(), s.size()), URLEncodedEntitiesForUnencodables);
>         output.resize(decoded.length());
>         memcpy(output.data(), decoded.data(), decoded.length());
>     } else {
>-        CString pathDecoded = pathEncoding.encode(s.data(), pathEnd, URLEncodedEntitiesForUnencodables);
>+        CString pathDecoded = pathEncoding.encode(StringView(s.data(), pathEnd), URLEncodedEntitiesForUnencodables);
>         // Unencodable characters in URLs are represented by converting
>         // them to XML entities and escaping non-alphanumeric characters.
>-        CString otherDecoded = encoding.encode(s.data() + pathEnd, s.size() - pathEnd, URLEncodedEntitiesForUnencodables);
>+        CString otherDecoded = encoding.encode(StringView(s.data() + pathEnd, s.size() - pathEnd), URLEncodedEntitiesForUnencodables);
> 
>         output.resize(pathDecoded.length() + otherDecoded.length());
>         memcpy(output.data(), pathDecoded.data(), pathDecoded.length());
>diff --git a/Source/WebCore/platform/graphics/Color.cpp b/Source/WebCore/platform/graphics/Color.cpp
>index db5eb8ee7793cbb720ec66f5066a83b506f13d82..8bc71469421dbd8ee9884309514f44c901543b42 100644
>--- a/Source/WebCore/platform/graphics/Color.cpp
>+++ b/Source/WebCore/platform/graphics/Color.cpp
>@@ -165,7 +165,7 @@ bool Color::parseHexColor(const String& name, RGBA32& rgb)
>         return false;
>     if (name.is8Bit())
>         return parseHexColor(name.characters8(), name.length(), rgb);
>-    return parseHexColor(name.deprecatedCharacters(), name.length(), rgb);
>+    return parseHexColor(name.characters16(), name.length(), rgb);
> }
> 
> int differenceSquared(const Color& c1, const Color& c2)
>@@ -182,7 +182,7 @@ Color::Color(const String& name)
>         if (name.is8Bit())
>             m_valid = parseHexColor(name.characters8() + 1, name.length() - 1, m_color);
>         else
>-            m_valid = parseHexColor(name.deprecatedCharacters() + 1, name.length() - 1, m_color);
>+            m_valid = parseHexColor(name.characters16() + 1, name.length() - 1, m_color);
>     } else
>         setNamedColor(name);
> }
>diff --git a/Source/WebCore/platform/graphics/StringTruncator.cpp b/Source/WebCore/platform/graphics/StringTruncator.cpp
>index edc54546901f7bc4209a8ecdf797420994bc2d94..e6640bd7ca7674ffa633d53c211a2aca079b562e 100644
>--- a/Source/WebCore/platform/graphics/StringTruncator.cpp
>+++ b/Source/WebCore/platform/graphics/StringTruncator.cpp
>@@ -89,12 +89,10 @@ static unsigned centerTruncateToBuffer(const String& string, unsigned length, un
>     unsigned truncatedLength = shouldInsertEllipsis ? omitStart + 1 + (length - omitEnd) : length - (omitEnd - omitStart);
>     ASSERT(truncatedLength <= length);
> 
>-    memcpy(buffer, string.deprecatedCharacters(), sizeof(UChar) * omitStart);
>-    if (shouldInsertEllipsis) {
>-        buffer[omitStart] = horizontalEllipsis;
>-        memcpy(&buffer[omitStart + 1], &string.deprecatedCharacters()[omitEnd], sizeof(UChar) * (length - omitEnd));
>-    } else
>-        memcpy(&buffer[omitStart], &string.deprecatedCharacters()[omitEnd], sizeof(UChar) * (length - omitEnd));
>+    StringView(string).substring(0, omitStart).getCharactersWithUpconvert(buffer);
>+    if (shouldInsertEllipsis)
>+        buffer[omitStart++] = horizontalEllipsis;
>+    StringView(string).substring(omitEnd, length - omitEnd).getCharactersWithUpconvert(&buffer[omitStart + 1]);
>     return truncatedLength;
> }
> 
>@@ -119,7 +117,7 @@ static unsigned rightTruncateToBuffer(const String& string, unsigned length, uns
>     unsigned keepLength = textBreakAtOrPreceding(it, keepCount);
>     unsigned truncatedLength = shouldInsertEllipsis ? keepLength + 1 : keepLength;
> 
>-    memcpy(buffer, string.deprecatedCharacters(), sizeof(UChar) * keepLength);
>+    StringView(string).substring(0, keepLength).getCharactersWithUpconvert(buffer);
>     if (shouldInsertEllipsis)
>         buffer[keepLength] = horizontalEllipsis;
> 
>@@ -133,7 +131,7 @@ static unsigned rightClipToCharacterBuffer(const String& string, unsigned length
> 
>     NonSharedCharacterBreakIterator it(StringView(string).substring(0, length));
>     unsigned keepLength = textBreakAtOrPreceding(it, keepCount);
>-    memcpy(buffer, string.deprecatedCharacters(), sizeof(UChar) * keepLength);
>+    StringView(string).substring(0, keepLength).getCharactersWithUpconvert(buffer);
> 
>     return keepLength;
> }
>@@ -145,7 +143,7 @@ static unsigned rightClipToWordBuffer(const String& string, unsigned length, uns
> 
>     TextBreakIterator* it = wordBreakIterator(StringView(string).substring(0, length));
>     unsigned keepLength = textBreakAtOrPreceding(it, keepCount);
>-    memcpy(buffer, string.deprecatedCharacters(), sizeof(UChar) * keepLength);
>+    StringView(string).substring(0, keepLength).getCharactersWithUpconvert(buffer);
> 
> #if PLATFORM(IOS)
>     // FIXME: We should guard this code behind an editing behavior. Then we can remove the PLATFORM(IOS)-guard.
>@@ -178,10 +176,10 @@ static unsigned leftTruncateToBuffer(const String& string, unsigned length, unsi
> 
>     if (shouldInsertEllipsis) {
>         buffer[0] = horizontalEllipsis;
>-        memcpy(&buffer[1], &string.deprecatedCharacters()[adjustedStartIndex], sizeof(UChar) * (length - adjustedStartIndex + 1));
>+        StringView(string).substring(adjustedStartIndex, length - adjustedStartIndex + 1).getCharactersWithUpconvert(&buffer[1]);
>         return length - adjustedStartIndex + 1;
>     }
>-    memcpy(&buffer[0], &string.deprecatedCharacters()[adjustedStartIndex], sizeof(UChar) * (length - adjustedStartIndex + 1));
>+    StringView(string).substring(adjustedStartIndex, length - adjustedStartIndex + 1).getCharactersWithUpconvert(&buffer[0]);
>     return length - adjustedStartIndex;
> }
> 
>@@ -218,7 +216,7 @@ static String truncateString(const String& string, float maxWidth, const Font& f
>         truncatedLength = centerTruncateToBuffer(string, length, keepCount, stringBuffer, shouldInsertEllipsis);
>     } else {
>         keepCount = length;
>-        memcpy(stringBuffer, string.deprecatedCharacters(), sizeof(UChar) * length);
>+        StringView(string).getCharactersWithUpconvert(stringBuffer);
>         truncatedLength = length;
>     }
> 
>diff --git a/Source/WebCore/platform/graphics/TextRun.h b/Source/WebCore/platform/graphics/TextRun.h
>index 698541e5da5693c5b98f41a871e66f8beb1c01d4..0b34bed24a676a4b66936de42496a908b85e6f15 100644
>--- a/Source/WebCore/platform/graphics/TextRun.h
>+++ b/Source/WebCore/platform/graphics/TextRun.h
>@@ -116,11 +116,11 @@ public:
>         , m_disableSpacing(false)
>         , m_tabSize(0)
>     {
>-        if (m_charactersLength && s.is8Bit()) {
>+        if (!m_charactersLength || s.is8Bit()) {
>             m_data.characters8 = s.characters8();
>             m_is8Bit = true;
>         } else {
>-            m_data.characters16 = s.deprecatedCharacters();
>+            m_data.characters16 = s.characters16();
>             m_is8Bit = false;
>         }
>     }
>diff --git a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm
>index 1f4d79aa139349d8abc92efe291b0240bb5f0493..6801424ec2650cf4a310bb778079b73fae6be592 100644
>--- a/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm
>+++ b/Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm
>@@ -1240,7 +1240,7 @@ bool MediaPlayerPrivateAVFoundationObjC::shouldWaitForLoadingOfResource(AVAssetR
>         initDataView->set<uint32_t>(0, keyURISize, true);
> 
>         RefPtr<Uint16Array> keyURIArray = Uint16Array::create(initDataBuffer, 4, keyURI.length());
>-        keyURIArray->setRange(keyURI.deprecatedCharacters(), keyURI.length() / sizeof(unsigned char), 0);
>+        keyURIArray->setRange(StringView(keyURI).upconvertedCharacters(), keyURI.length() / sizeof(unsigned char), 0);
> 
> #if ENABLE(ENCRYPTED_MEDIA)
>         if (!player()->keyNeeded("com.apple.lskd", emptyString(), static_cast<const unsigned char*>(initDataBuffer->data()), initDataBuffer->byteLength()))
>diff --git a/Source/WebCore/platform/network/FormDataBuilder.cpp b/Source/WebCore/platform/network/FormDataBuilder.cpp
>index a76916ebdf510e7827698b1968ea35b0ba86e904..acad8e0a77468d1c19b33b539325d3d00bf9ec38 100644
>--- a/Source/WebCore/platform/network/FormDataBuilder.cpp
>+++ b/Source/WebCore/platform/network/FormDataBuilder.cpp
>@@ -28,12 +28,12 @@
> #include "Blob.h"
> #include "Document.h"
> #include "TextEncoding.h"
>-
> #include <limits>
> #include <wtf/Assertions.h>
> #include <wtf/HexNumber.h>
>-#include <wtf/text/CString.h>
> #include <wtf/RandomNumber.h>
>+#include <wtf/text/CString.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -61,12 +61,11 @@ static void appendQuotedString(Vector<char>& buffer, const CString& string)
>     size_t length = string.length();
>     for (size_t i = 0; i < length; ++i) {
>         char c = string.data()[i];
>-
>         switch (c) {
>-        case  0x0a:
>+        case 0xA:
>             append(buffer, "%0A");
>             break;
>-        case 0x0d:
>+        case 0xD:
>             append(buffer, "%0D");
>             break;
>         case '"':
>@@ -86,11 +85,9 @@ TextEncoding FormDataBuilder::encodingFromAcceptCharset(const String& acceptChar
>     Vector<String> charsets;
>     normalizedAcceptCharset.split(' ', charsets);
> 
>-    TextEncoding encoding;
>-
>-    Vector<String>::const_iterator end = charsets.end();
>-    for (Vector<String>::const_iterator it = charsets.begin(); it != end; ++it) {
>-        if ((encoding = TextEncoding(*it)).isValid())
>+    for (auto& charset : charsets) {
>+        TextEncoding encoding(charset);
>+        if (encoding.isValid())
>             return encoding;
>     }
> 
>@@ -165,7 +162,7 @@ void FormDataBuilder::addFilenameToMultiPartHeader(Vector<char>& buffer, const T
>     // FIXME: This loses data irreversibly if the filename includes characters you can't encode
>     // in the website's character set.
>     append(buffer, "; filename=\"");
>-    appendQuotedString(buffer, encoding.encode(filename.deprecatedCharacters(), filename.length(), QuestionMarksForUnencodables));
>+    appendQuotedString(buffer, encoding.encode(filename, QuestionMarksForUnencodables));
>     append(buffer, '"');
> }
> 
>diff --git a/Source/WebCore/platform/sql/SQLiteStatement.cpp b/Source/WebCore/platform/sql/SQLiteStatement.cpp
>index 4b2b77160edf03f8291be778befe49b975fb7fb0..ee1b88f31ed7405dec929cfdf59775c928ac9daf 100644
>--- a/Source/WebCore/platform/sql/SQLiteStatement.cpp
>+++ b/Source/WebCore/platform/sql/SQLiteStatement.cpp
>@@ -30,7 +30,7 @@
> #include "SQLValue.h"
> #include <sqlite3.h>
> #include <wtf/Assertions.h>
>-#include <wtf/text/StringImpl.h>
>+#include <wtf/text/StringView.h>
> 
> // SQLite 3.6.16 makes sqlite3_prepare_v2 automatically retry preparing the statement
> // once if the database scheme has changed. We rely on this behavior.
>@@ -177,12 +177,13 @@ int SQLiteStatement::bindBlob(int index, const String& text)
> {
>     // String::characters() returns 0 for the empty string, which SQLite
>     // treats as a null, so we supply a non-null pointer for that case.
>+    auto upconvertedCharacters = StringView(text).upconvertedCharacters();
>     UChar anyCharacter = 0;
>     const UChar* characters;
>     if (text.isEmpty() && !text.isNull())
>         characters = &anyCharacter;
>     else
>-        characters = text.deprecatedCharacters();
>+        characters = upconvertedCharacters;
> 
>     return bindBlob(index, characters, text.length() * sizeof(UChar));
> }
>@@ -195,12 +196,13 @@ int SQLiteStatement::bindText(int index, const String& text)
> 
>     // String::characters() returns 0 for the empty string, which SQLite
>     // treats as a null, so we supply a non-null pointer for that case.
>+    auto upconvertedCharacters = StringView(text).upconvertedCharacters();
>     UChar anyCharacter = 0;
>     const UChar* characters;
>     if (text.isEmpty() && !text.isNull())
>         characters = &anyCharacter;
>     else
>-        characters = text.deprecatedCharacters();
>+        characters = upconvertedCharacters;
> 
>     return sqlite3_bind_text16(m_statement, index, characters, sizeof(UChar) * text.length(), SQLITE_TRANSIENT);
> }
>diff --git a/Source/WebCore/platform/text/DecodeEscapeSequences.h b/Source/WebCore/platform/text/DecodeEscapeSequences.h
>index 2fa6e4658918c6411b1c11657c6d70daa69f02f6..c8a2892fa2d00a556dc097a6039ac99cfde14b98 100644
>--- a/Source/WebCore/platform/text/DecodeEscapeSequences.h
>+++ b/Source/WebCore/platform/text/DecodeEscapeSequences.h
>@@ -51,19 +51,19 @@ struct Unicode16BitEscapeSequence {
>         }
>         return runEnd;
>     }
>-    static String decodeRun(const UChar* run, size_t runLength, const TextEncoding&)
>+    static String decodeRun(StringView run, const TextEncoding&)
>     {
>         // Each %u-escape sequence represents a UTF-16 code unit.
>         // See <http://www.w3.org/International/iri-edit/draft-duerst-iri.html#anchor29>.
>         // For 16-bit escape sequences, we know that findEndOfRun() has given us a contiguous run of sequences
>         // without any intervening characters, so decode the run without additional checks.
>-        size_t numberOfSequences = runLength / sequenceSize;
>+        auto numberOfSequences = run.length() / sequenceSize;
>         StringBuilder builder;
>         builder.reserveCapacity(numberOfSequences);
>         while (numberOfSequences--) {
>             UChar codeUnit = (toASCIIHexValue(run[2]) << 12) | (toASCIIHexValue(run[3]) << 8) | (toASCIIHexValue(run[4]) << 4) | toASCIIHexValue(run[5]);
>             builder.append(codeUnit);
>-            run += sequenceSize;
>+            run = run.substring(sequenceSize);
>         }
>         return builder.toString();
>     }
>@@ -96,21 +96,20 @@ struct URLEscapeSequence {
>         }
>         return runEnd;
>     }
>-    static String decodeRun(const UChar* run, size_t runLength, const TextEncoding& encoding)
>+    static String decodeRun(StringView run, const TextEncoding& encoding)
>     {
>         // For URL escape sequences, we know that findEndOfRun() has given us a run where every %-sign introduces
>         // a valid escape sequence, but there may be characters between the sequences.
>         Vector<char, 512> buffer;
>-        buffer.resize(runLength); // Unescaping hex sequences only makes the length smaller.
>+        buffer.resize(run.length()); // Unescaping hex sequences only makes the length smaller.
>         char* p = buffer.data();
>-        const UChar* runEnd = run + runLength;
>-        while (run < runEnd) {
>+        while (!run.isEmpty()) {
>             if (run[0] == '%') {
>                 *p++ = (toASCIIHexValue(run[1]) << 4) | toASCIIHexValue(run[2]);
>-                run += sequenceSize;
>+                run = run.substring(sequenceSize);
>             } else {
>                 *p++ = run[0];
>-                run += 1;
>+                run = run.substring(1);
>             }
>         }
>         ASSERT(buffer.size() >= static_cast<size_t>(p - buffer.data())); // Prove buffer not overrun.
>@@ -134,7 +133,7 @@ String decodeEscapeSequences(const String& string, const TextEncoding& encoding)
>             continue;
>         }
> 
>-        String decoded = EscapeSequence::decodeRun(string.deprecatedCharacters() + encodedRunPosition, encodedRunEnd - encodedRunPosition, encoding);
>+        String decoded = EscapeSequence::decodeRun(StringView(string).substring(encodedRunPosition, encodedRunEnd - encodedRunPosition), encoding);
>         if (decoded.isEmpty())
>             continue;
> 
>diff --git a/Source/WebCore/platform/text/Hyphenation.cpp b/Source/WebCore/platform/text/Hyphenation.cpp
>index 89f64386a9ebc887699bbee01f8e99ea1b2eec2d..abda744f90cf32d41ae92330cd26a1a6885e695c 100644
>--- a/Source/WebCore/platform/text/Hyphenation.cpp
>+++ b/Source/WebCore/platform/text/Hyphenation.cpp
>@@ -35,7 +35,7 @@ bool canHyphenate(const AtomicString& /* localeIdentifier */)
>     return false;
> }
> 
>-size_t lastHyphenLocation(const UChar* /* characters */, size_t /* length */, size_t /* beforeIndex */, const AtomicString& /* localeIdentifier */)
>+size_t lastHyphenLocation(StringView, size_t /* beforeIndex */, const AtomicString& /* localeIdentifier */)
> {
>     ASSERT_NOT_REACHED();
>     return 0;
>diff --git a/Source/WebCore/platform/text/Hyphenation.h b/Source/WebCore/platform/text/Hyphenation.h
>index 20882dca54d6434eb6cdcd2b63c8283cfbe5df70..38f2af136ae15a08e2f91cc1cad57ab448b50646 100644
>--- a/Source/WebCore/platform/text/Hyphenation.h
>+++ b/Source/WebCore/platform/text/Hyphenation.h
>@@ -32,7 +32,7 @@
> namespace WebCore {
> 
> bool canHyphenate(const AtomicString& localeIdentifier);
>-size_t lastHyphenLocation(const UChar*, size_t length, size_t beforeIndex, const AtomicString& localeIdentifier);
>+size_t lastHyphenLocation(StringView, size_t beforeIndex, const AtomicString& localeIdentifier);
> 
> } // namespace WebCore
> 
>diff --git a/Source/WebCore/platform/text/TextBreakIterator.cpp b/Source/WebCore/platform/text/TextBreakIterator.cpp
>index 108d3b65dc7955bc045215566175612ea20f3aff..478608343f4e70033492f3c0859e17cd277e1549 100644
>--- a/Source/WebCore/platform/text/TextBreakIterator.cpp
>+++ b/Source/WebCore/platform/text/TextBreakIterator.cpp
>@@ -28,7 +28,6 @@
> #include <mutex>
> #include <wtf/Atomics.h>
> #include <wtf/text/StringView.h>
>-#include <wtf/text/WTFString.h>
> 
> namespace WebCore {
> 
>@@ -43,16 +42,19 @@ static TextBreakIterator* initializeIterator(UBreakIteratorType type, const char
> }
> 
> #if !PLATFORM(IOS)
>+
> static TextBreakIterator* initializeIteratorWithRules(const char* breakRules)
> {
>     UParseError parseStatus;
>     UErrorCode openStatus = U_ZERO_ERROR;
>-    String rules(breakRules);
>-    TextBreakIterator* iterator = reinterpret_cast<TextBreakIterator*>(ubrk_openRules(rules.deprecatedCharacters(), rules.length(), 0, 0, &parseStatus, &openStatus));
>+    unsigned length = strlen(breakRules);
>+    auto upconvertedCharacters = StringView(reinterpret_cast<const LChar*>(breakRules), length).upconvertedCharacters();
>+    TextBreakIterator* iterator = reinterpret_cast<TextBreakIterator*>(ubrk_openRules(upconvertedCharacters, length, 0, 0, &parseStatus, &openStatus));
>     ASSERT_WITH_MESSAGE(U_SUCCESS(openStatus), "ICU could not open a break iterator: %s (%d)", u_errorName(openStatus), openStatus);
>     return iterator;
> }
>-#endif // !PLATFORM(IOS)
>+
>+#endif
> 
> 
> // Iterator text setting
>diff --git a/Source/WebCore/platform/text/TextEncoding.cpp b/Source/WebCore/platform/text/TextEncoding.cpp
>index 5666255733fef92d523c91b758d6b152e85869c0..db82bd7590f857f7c793218fed45cdfb02981942 100644
>--- a/Source/WebCore/platform/text/TextEncoding.cpp
>+++ b/Source/WebCore/platform/text/TextEncoding.cpp
>@@ -34,7 +34,7 @@
> #include <wtf/OwnPtr.h>
> #include <wtf/StdLibExtras.h>
> #include <wtf/text/CString.h>
>-#include <wtf/text/WTFString.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -64,20 +64,22 @@ String TextEncoding::decode(const char* data, size_t length, bool stopOnError, b
>     return newTextCodec(*this)->decode(data, length, true, stopOnError, sawError);
> }
> 
>-CString TextEncoding::encode(const UChar* characters, size_t length, UnencodableHandling handling) const
>+CString TextEncoding::encode(StringView text, UnencodableHandling handling) const
> {
>     if (!m_name)
>         return CString();
> 
>-    if (!length)
>+    if (text.isEmpty())
>         return "";
> 
>     // FIXME: What's the right place to do normalization?
>     // It's a little strange to do it inside the encode function.
>     // Perhaps normalization should be an explicit step done before calling encode.
> 
>-    const UChar* source = characters;
>-    size_t sourceLength = length;
>+    auto upconvertedCharacters = text.upconvertedCharacters();
>+
>+    const UChar* source = upconvertedCharacters;
>+    size_t sourceLength = text.length();
> 
>     Vector<UChar> normalizedCharacters;
> 
>@@ -85,17 +87,18 @@ CString TextEncoding::encode(const UChar* characters, size_t length, Unencodable
>     if (unorm_quickCheck(source, sourceLength, UNORM_NFC, &err) != UNORM_YES) {
>         // First try using the length of the original string, since normalization to NFC rarely increases length.
>         normalizedCharacters.grow(sourceLength);
>-        int32_t normalizedLength = unorm_normalize(source, length, UNORM_NFC, 0, normalizedCharacters.data(), length, &err);
>+        int32_t normalizedLength = unorm_normalize(source, sourceLength, UNORM_NFC, 0, normalizedCharacters.data(), sourceLength, &err);
>         if (err == U_BUFFER_OVERFLOW_ERROR) {
>             err = U_ZERO_ERROR;
>             normalizedCharacters.resize(normalizedLength);
>-            normalizedLength = unorm_normalize(source, length, UNORM_NFC, 0, normalizedCharacters.data(), normalizedLength, &err);
>+            normalizedLength = unorm_normalize(source, sourceLength, UNORM_NFC, 0, normalizedCharacters.data(), normalizedLength, &err);
>         }
>         ASSERT(U_SUCCESS(err));
> 
>         source = normalizedCharacters.data();
>         sourceLength = normalizedLength;
>     }
>+
>     return newTextCodec(*this)->encode(source, sourceLength, handling);
> }
> 
>diff --git a/Source/WebCore/platform/text/TextEncoding.h b/Source/WebCore/platform/text/TextEncoding.h
>index 1a1fab42cec493ac41d60b9b77a7ca7ff68888b2..c9cf6c2459884ba729f7af76c6e9f0df57b8a048 100644
>--- a/Source/WebCore/platform/text/TextEncoding.h
>+++ b/Source/WebCore/platform/text/TextEncoding.h
>@@ -69,7 +69,7 @@ namespace WebCore {
>             return decode(str, length, false, ignored);
>         }
>         String decode(const char*, size_t length, bool stopOnError, bool& sawError) const;
>-        CString encode(const UChar*, size_t length, UnencodableHandling) const;
>+        CString encode(StringView, UnencodableHandling) const;
> 
>         UChar backslashAsCurrencySymbol() const;
> 
>diff --git a/Source/WebCore/platform/text/TextEncodingRegistry.cpp b/Source/WebCore/platform/text/TextEncodingRegistry.cpp
>index f53671f54b79d6501d2c98e5ad0f7bffc2c0ea08..b8b2999760df3d7e3d408aaacaf3c215469e4d7a 100644
>--- a/Source/WebCore/platform/text/TextEncodingRegistry.cpp
>+++ b/Source/WebCore/platform/text/TextEncodingRegistry.cpp
>@@ -336,12 +336,12 @@ const char* atomicCanonicalTextEncodingName(const CharacterType* characters, siz
> const char* atomicCanonicalTextEncodingName(const String& alias)
> {
>     if (!alias.length())
>-        return 0;
>+        return nullptr;
> 
>     if (alias.is8Bit())
>-        return atomicCanonicalTextEncodingName<LChar>(alias.characters8(), alias.length());
>+        return atomicCanonicalTextEncodingName(alias.characters8(), alias.length());
> 
>-    return atomicCanonicalTextEncodingName<UChar>(alias.deprecatedCharacters(), alias.length());
>+    return atomicCanonicalTextEncodingName(alias.characters16(), alias.length());
> }
> 
> bool noExtendedTextEncodingNameUsed()
>diff --git a/Source/WebCore/platform/text/cf/HyphenationCF.cpp b/Source/WebCore/platform/text/cf/HyphenationCF.cpp
>index c7802b9b019a15406673a57b877a53fceb2ef379..a344bd85336e4947e30ff7e472bb5a52192b1622 100644
>--- a/Source/WebCore/platform/text/cf/HyphenationCF.cpp
>+++ b/Source/WebCore/platform/text/cf/HyphenationCF.cpp
>@@ -31,6 +31,7 @@
> #include "TextBreakIteratorInternalICU.h"
> #include <wtf/ListHashSet.h>
> #include <wtf/RetainPtr.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -73,15 +74,13 @@ bool canHyphenate(const AtomicString& localeIdentifier)
> #endif // PLATFORM(IOS)
> }
> 
>-size_t lastHyphenLocation(const UChar* characters, size_t length, size_t beforeIndex, const AtomicString& localeIdentifier)
>+size_t lastHyphenLocation(StringView text, size_t beforeIndex, const AtomicString& localeIdentifier)
> {
>-    RetainPtr<CFStringRef> string = adoptCF(CFStringCreateWithCharactersNoCopy(kCFAllocatorDefault, reinterpret_cast<const UniChar*>(characters), length, kCFAllocatorNull));
>-
>     RetainPtr<CFLocaleRef> locale = cfLocaleCache().get(localeIdentifier);
>     ASSERT(locale);
> 
>     CFOptionFlags searchAcrossWordBoundaries = 1;
>-    CFIndex result = CFStringGetHyphenationLocationBeforeIndex(string.get(), beforeIndex, CFRangeMake(0, length), searchAcrossWordBoundaries, locale.get(), 0);
>+    CFIndex result = CFStringGetHyphenationLocationBeforeIndex(text.createCFStringWithoutCopying().get(), beforeIndex, CFRangeMake(0, text.length()), searchAcrossWordBoundaries, locale.get(), 0);
>     return result == kCFNotFound ? 0 : result;
> }
> 
>diff --git a/Source/WebCore/rendering/RenderBlock.cpp b/Source/WebCore/rendering/RenderBlock.cpp
>index 3bcda723fb8a1a62feebb2448e6e70f86ecdeeff..8ddb655aaf5d892b3282d9239ce6b3854a7f87b3 100644
>--- a/Source/WebCore/rendering/RenderBlock.cpp
>+++ b/Source/WebCore/rendering/RenderBlock.cpp
>@@ -5277,9 +5277,9 @@ TextRun RenderBlock::constructTextRun(RenderObject* context, const Font& font, c
> {
>     unsigned length = string.length();
> 
>-    if (length && string.is8Bit())
>+    if (!length || string.is8Bit())
>         return constructTextRunInternal(context, font, string.characters8(), length, style, expansion, flags);
>-    return constructTextRunInternal(context, font, string.deprecatedCharacters(), length, style, expansion, flags);
>+    return constructTextRunInternal(context, font, string.characters16(), length, style, expansion, flags);
> }
> 
> RenderBlock* RenderBlock::createAnonymousWithParentRendererAndDisplay(const RenderObject* parent, EDisplay display)
>diff --git a/Source/WebCore/rendering/RenderCombineText.cpp b/Source/WebCore/rendering/RenderCombineText.cpp
>index ffee00f17366831ea6cb1ad228ef0b0ac7bd797a..11f8b9762e5d49c7c73ce7a7b1d6e52114532cb3 100644
>--- a/Source/WebCore/rendering/RenderCombineText.cpp
>+++ b/Source/WebCore/rendering/RenderCombineText.cpp
>@@ -60,9 +60,6 @@ void RenderCombineText::setTextInternal(const String& text)
> 
> float RenderCombineText::width(unsigned from, unsigned length, const Font& font, float xPosition, HashSet<const SimpleFontData*>* fallbackFonts, GlyphOverflow* glyphOverflow) const
> {
>-    if (!deprecatedCharacters())
>-        return 0;
>-
>     if (m_isCombined)
>         return font.size();
> 
>diff --git a/Source/WebCore/rendering/RenderText.cpp b/Source/WebCore/rendering/RenderText.cpp
>index 9f2e9372b61fa01f46b5951af89feffa7f3108ab..cdea9ff48e6959c91d782bada7af494f3a46db57 100644
>--- a/Source/WebCore/rendering/RenderText.cpp
>+++ b/Source/WebCore/rendering/RenderText.cpp
>@@ -624,15 +624,15 @@ static inline float hyphenWidth(RenderText* renderer, const Font& font)
>     return font.width(RenderBlock::constructTextRun(renderer, font, style.hyphenString().string(), style));
> }
> 
>-static float maxWordFragmentWidth(RenderText* renderer, const RenderStyle& style, const Font& font, const UChar* word, int wordLength, int minimumPrefixLength, int minimumSuffixLength, int& suffixStart, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow& glyphOverflow)
>+static float maxWordFragmentWidth(RenderText* renderer, const RenderStyle& style, const Font& font, StringView word, int minimumPrefixLength, unsigned minimumSuffixLength, int& suffixStart, HashSet<const SimpleFontData*>& fallbackFonts, GlyphOverflow& glyphOverflow)
> {
>     suffixStart = 0;
>-    if (wordLength <= minimumSuffixLength)
>+    if (word.length() <= minimumSuffixLength)
>         return 0;
> 
>     Vector<int, 8> hyphenLocations;
>-    int hyphenLocation = wordLength - minimumSuffixLength;
>-    while ((hyphenLocation = lastHyphenLocation(word, wordLength, hyphenLocation, style.locale())) >= minimumPrefixLength)
>+    int hyphenLocation = word.length() - minimumSuffixLength;
>+    while ((hyphenLocation = lastHyphenLocation(word, hyphenLocation, style.locale())) >= minimumPrefixLength)
>         hyphenLocations.append(hyphenLocation);
> 
>     if (hyphenLocations.isEmpty())
>@@ -645,7 +645,7 @@ static float maxWordFragmentWidth(RenderText* renderer, const RenderStyle& style
>     for (size_t k = 0; k < hyphenLocations.size(); ++k) {
>         int fragmentLength = hyphenLocations[k] - suffixStart;
>         StringBuilder fragmentWithHyphen;
>-        fragmentWithHyphen.append(word + suffixStart, fragmentLength);
>+        fragmentWithHyphen.append(word.substring(suffixStart, fragmentLength));
>         fragmentWithHyphen.append(style.hyphenString());
> 
>         TextRun run = RenderBlock::constructTextRun(renderer, font, fragmentWithHyphen.deprecatedCharacters(), fragmentWithHyphen.length(), style);
>@@ -797,7 +797,7 @@ void RenderText::computePreferredLogicalWidths(float leadWidth, HashSet<const Si
> 
>             if (w > maxWordWidth) {
>                 int suffixStart;
>-                float maxFragmentWidth = maxWordFragmentWidth(this, style, font, deprecatedCharacters() + i, wordLen, minimumPrefixLength, minimumSuffixLength, suffixStart, fallbackFonts, glyphOverflow);
>+                float maxFragmentWidth = maxWordFragmentWidth(this, style, font, StringView(m_text).substring(i, wordLen), minimumPrefixLength, minimumSuffixLength, suffixStart, fallbackFonts, glyphOverflow);
> 
>                 if (suffixStart) {
>                     float suffixWidth;
>diff --git a/Source/WebCore/rendering/line/BreakingContextInlineHeaders.h b/Source/WebCore/rendering/line/BreakingContextInlineHeaders.h
>index 9e89cdf977ecb511a5f9b092320db31e11e0f22a..24ae58829c66180098f8ae10f09c5327f7c302c9 100644
>--- a/Source/WebCore/rendering/line/BreakingContextInlineHeaders.h
>+++ b/Source/WebCore/rendering/line/BreakingContextInlineHeaders.h
>@@ -597,11 +597,11 @@ inline void tryHyphenating(RenderText* text, const Font& font, const AtomicStrin
>     if (prefixLength < minimumPrefixLength)
>         return;
> 
>-    prefixLength = lastHyphenLocation(text->deprecatedCharacters() + lastSpace, pos - lastSpace, std::min(prefixLength, pos - lastSpace - minimumSuffixLength) + 1, localeIdentifier);
>+    prefixLength = lastHyphenLocation(StringView(text->text()).substring(lastSpace, pos - lastSpace), std::min(prefixLength, pos - lastSpace - minimumSuffixLength) + 1, localeIdentifier);
>     if (!prefixLength || prefixLength < minimumPrefixLength)
>         return;
> 
>-    // When lastSapce is a space, which it always is except sometimes at the beginning of a line or after collapsed
>+    // When lastSpace is a space, which it always is except sometimes at the beginning of a line or after collapsed
>     // space, it should not count towards hyphenate-limit-before.
>     if (prefixLength == minimumPrefixLength) {
>         UChar characterAtLastSpace = text->characterAt(lastSpace);
>diff --git a/Source/WebCore/rendering/svg/SVGTextLayoutEngine.cpp b/Source/WebCore/rendering/svg/SVGTextLayoutEngine.cpp
>index a90da0cdeff1873ed77f94020649d80775f65cf7..4df29c4eaa5a32a8731f95bc4207bca921460479 100644
>--- a/Source/WebCore/rendering/svg/SVGTextLayoutEngine.cpp
>+++ b/Source/WebCore/rendering/svg/SVGTextLayoutEngine.cpp
>@@ -436,7 +436,8 @@ void SVGTextLayoutEngine::layoutTextOnLineOrPath(SVGInlineTextBox* textBox, Rend
>     Vector<SVGTextMetrics>& visualMetricsValues = text->layoutAttributes()->textMetricsValues();
>     ASSERT(!visualMetricsValues.isEmpty());
> 
>-    const UChar* characters = text->deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(text->text()).upconvertedCharacters();
>+    const UChar* characters = upconvertedCharacters;
>     const Font& font = style->font();
> 
>     SVGTextLayoutEngineSpacing spacingLayout(font);
>diff --git a/Source/WebCore/rendering/svg/SVGTextMetrics.cpp b/Source/WebCore/rendering/svg/SVGTextMetrics.cpp
>index 7b899e82f660c03609d77eca8afca5574ce61751..07573f34001ae91fd15c5371074123aa03a66303 100644
>--- a/Source/WebCore/rendering/svg/SVGTextMetrics.cpp
>+++ b/Source/WebCore/rendering/svg/SVGTextMetrics.cpp
>@@ -105,7 +105,7 @@ SVGTextMetrics::SVGTextMetrics(RenderSVGInlineText* text, unsigned position, uns
>     m_height = text->scaledFont().fontMetrics().floatHeight() / scalingFactor;
>     if (needsContext) {
>         m_glyph.isValid = true;
>-        m_glyph.unicodeString = String(text->deprecatedCharacters() + position, length);
>+        m_glyph.unicodeString = text->text()->substring(position, length);
>         m_glyph.name = glyphName;
>     }
> 
>diff --git a/Source/WebCore/svg/SVGAngle.cpp b/Source/WebCore/svg/SVGAngle.cpp
>index 94e8fb2a674cd8697c7c68c30a6a6885b1cd4676..588f277be75de7d41efed05ca4958be62617857d 100644
>--- a/Source/WebCore/svg/SVGAngle.cpp
>+++ b/Source/WebCore/svg/SVGAngle.cpp
>@@ -25,7 +25,7 @@
> #include "ExceptionCode.h"
> #include "SVGParserUtilities.h"
> #include <wtf/MathExtras.h>
>-#include <wtf/text/WTFString.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -140,7 +140,8 @@ void SVGAngle::setValueAsString(const String& value, ExceptionCode& ec)
>     }
> 
>     float valueInSpecifiedUnits = 0;
>-    const UChar* ptr = value.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(value).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + value.length();
> 
>     if (!parseNumber(ptr, end, valueInSpecifiedUnits, false)) {
>diff --git a/Source/WebCore/svg/SVGAnimateMotionElement.cpp b/Source/WebCore/svg/SVGAnimateMotionElement.cpp
>index b979a75035c35298241bc2c132d971f6218b43e5..bf1c757db97c736c610b879922f3f5f88a8d0a5b 100644
>--- a/Source/WebCore/svg/SVGAnimateMotionElement.cpp
>+++ b/Source/WebCore/svg/SVGAnimateMotionElement.cpp
>@@ -38,6 +38,7 @@
> #include "SVGTransformList.h"
> #include <wtf/MathExtras.h>
> #include <wtf/StdLibExtras.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
>     
>@@ -156,7 +157,8 @@ static bool parsePoint(const String& s, FloatPoint& point)
> {
>     if (s.isEmpty())
>         return false;
>-    const UChar* cur = s.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(s).upconvertedCharacters();
>+    const UChar* cur = upconvertedCharacters;
>     const UChar* end = cur + s.length();
>     
>     if (!skipOptionalSVGSpaces(cur, end))
>diff --git a/Source/WebCore/svg/SVGAnimationElement.cpp b/Source/WebCore/svg/SVGAnimationElement.cpp
>index ce91f1bd83457acbfbec3fc010d5c69d098faa57..a52d2cc8948ec78e21d905f1b4a0e271a1968e10 100644
>--- a/Source/WebCore/svg/SVGAnimationElement.cpp
>+++ b/Source/WebCore/svg/SVGAnimationElement.cpp
>@@ -38,6 +38,7 @@
> #include "SVGNames.h"
> #include "SVGParserUtilities.h"
> #include <wtf/MathExtras.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -92,7 +93,9 @@ static void parseKeySplines(const String& parse, Vector<UnitBezier>& result)
>     result.clear();
>     if (parse.isEmpty())
>         return;
>-    const UChar* cur = parse.deprecatedCharacters();
>+
>+    auto upconvertedCharacters = StringView(parse).upconvertedCharacters();
>+    const UChar* cur = upconvertedCharacters;
>     const UChar* end = cur + parse.length();
> 
>     skipOptionalSVGSpaces(cur, end);
>diff --git a/Source/WebCore/svg/SVGFitToViewBox.cpp b/Source/WebCore/svg/SVGFitToViewBox.cpp
>index a51aaf2c7ea703b40505bda6779636bb2b8b7c8a..e30e27065f7ed6f38b1b0171a2d5ce49e1fce7ab 100644
>--- a/Source/WebCore/svg/SVGFitToViewBox.cpp
>+++ b/Source/WebCore/svg/SVGFitToViewBox.cpp
>@@ -29,15 +29,15 @@
> #include "SVGNames.h"
> #include "SVGParserUtilities.h"
> #include "SVGPreserveAspectRatio.h"
>-#include <wtf/text/StringImpl.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
> bool SVGFitToViewBox::parseViewBox(Document* doc, const String& s, FloatRect& viewBox)
> {
>-    const UChar* c = s.deprecatedCharacters();
>-    const UChar* end = c + s.length();
>-    return parseViewBox(doc, c, end, viewBox, true);
>+    auto upconvertedCharacters = StringView(s).upconvertedCharacters();
>+    const UChar* characters = upconvertedCharacters;
>+    return parseViewBox(doc, characters, characters + s.length(), viewBox, true);
> }
> 
> bool SVGFitToViewBox::parseViewBox(Document* doc, const UChar*& c, const UChar* end, FloatRect& viewBox, bool validate)
>diff --git a/Source/WebCore/svg/SVGFontData.cpp b/Source/WebCore/svg/SVGFontData.cpp
>index 191ff80dee4c17406482ec6e33afc21ee1ad43c8..80710ce6cfcc58abb6ddb1f91e3fd4d22e42c0dc 100644
>--- a/Source/WebCore/svg/SVGFontData.cpp
>+++ b/Source/WebCore/svg/SVGFontData.cpp
>@@ -41,6 +41,8 @@ using namespace Unicode;
> 
> namespace WebCore {
> 
>+static String createStringWithMirroredCharacters(StringView);
>+
> SVGFontData::SVGFontData(SVGFontFaceElement* fontFaceElement)
>     : m_svgFontFaceElement(fontFaceElement)
>     , m_horizontalOriginX(fontFaceElement->horizontalOriginX())
>@@ -146,7 +148,7 @@ bool SVGFontData::applySVGGlyphSelection(WidthIterator& iterator, GlyphData& gly
>     }
> 
>     if (mirror)
>-        remainingTextInRun = createStringWithMirroredCharacters(remainingTextInRun.deprecatedCharacters(), remainingTextInRun.length());
>+        remainingTextInRun = createStringWithMirroredCharacters(remainingTextInRun);
>     if (!currentCharacter && arabicForms.isEmpty())
>         arabicForms = charactersWithArabicForm(remainingTextInRun, mirror);
> 
>@@ -287,18 +289,16 @@ bool SVGFontData::fillNonBMPGlyphs(SVGFontElement* fontElement, GlyphPage* pageT
>     return haveGlyphs;
> }
> 
>-String SVGFontData::createStringWithMirroredCharacters(const UChar* characters, unsigned length) const
>+String createStringWithMirroredCharacters(StringView string)
> {
>+    unsigned length = string.length();
>     StringBuilder mirroredCharacters;
>     mirroredCharacters.reserveCapacity(length);
>-
>-    unsigned i = 0;
>-    while (i < length) {
>+    for (unsigned i = 0; i < length; ) {
>         UChar32 character;
>-        U16_NEXT(characters, i, length, character);
>+        U16_NEXT(string, i, length, character);
>         mirroredCharacters.append(u_charMirror(character));
>     }
>-
>     return mirroredCharacters.toString();
> }
> 
>diff --git a/Source/WebCore/svg/SVGFontData.h b/Source/WebCore/svg/SVGFontData.h
>index 3fb967cf0c5e3a2ae33703f04059a8e7c255d14d..72728a17aa44b396cd04124b512492380cf22439 100644
>--- a/Source/WebCore/svg/SVGFontData.h
>+++ b/Source/WebCore/svg/SVGFontData.h
>@@ -52,8 +52,6 @@ private:
>     bool fillBMPGlyphs(SVGFontElement*, GlyphPage* , unsigned offset, unsigned length, UChar* buffer, const SimpleFontData*) const;
>     bool fillNonBMPGlyphs(SVGFontElement*, GlyphPage* , unsigned offset, unsigned length, UChar* buffer, const SimpleFontData*) const;
> 
>-    String createStringWithMirroredCharacters(const UChar* characters, unsigned length) const;
>-
>     // Ths SVGFontFaceElement is kept alive --
>     // 1) in the external font case: by the CSSFontFaceSource, which holds a reference to the external SVG document
>     //    containing the element;
>diff --git a/Source/WebCore/svg/SVGFontElement.cpp b/Source/WebCore/svg/SVGFontElement.cpp
>index c0355239f043118e0f590d42cf932d751a032400..a20a6569224434f33e08c9e796399e9124ab2877 100644
>--- a/Source/WebCore/svg/SVGFontElement.cpp
>+++ b/Source/WebCore/svg/SVGFontElement.cpp
>@@ -94,9 +94,9 @@ void SVGFontElement::registerLigaturesInGlyphCache(Vector<String>& ligatures)
>         unsigned unicodeLength = unicode.length();
>         ASSERT(unicodeLength > 1);
> 
>-        const UChar* characters = unicode.deprecatedCharacters();
>         for (unsigned i = 0; i < unicodeLength; ++i) {
>-            String lookupString(characters + i, 1);
>+            UChar character = unicode[i];
>+            String lookupString(&character, 1);
>             m_glyphMap.collectGlyphsForString(lookupString, glyphs);
>             if (!glyphs.isEmpty()) {
>                 glyphs.clear();
>diff --git a/Source/WebCore/svg/SVGGlyphMap.h b/Source/WebCore/svg/SVGGlyphMap.h
>index 00f87a58ce080505be2995db77c13d8e8c5fb66a..3518f88d8a66197404a2304292dd14bb77254daf 100644
>--- a/Source/WebCore/svg/SVGGlyphMap.h
>+++ b/Source/WebCore/svg/SVGGlyphMap.h
>@@ -21,11 +21,12 @@
> #define SVGGlyphMap_h
> 
> #if ENABLE(SVG_FONTS)
>+
> #include "SurrogatePairAwareTextIterator.h"
> #include "SVGGlyph.h"
>-
> #include <wtf/HashMap.h>
> #include <wtf/Vector.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -68,7 +69,8 @@ public:
> 
>         UChar32 character = 0;
>         unsigned clusterLength = 0;
>-        SurrogatePairAwareTextIterator textIterator(unicodeString.deprecatedCharacters(), 0, length, length);
>+        auto upconvertedCharacters = StringView(unicodeString).upconvertedCharacters();
>+        SurrogatePairAwareTextIterator textIterator(upconvertedCharacters, 0, length, length);
>         while (textIterator.consume(character, clusterLength)) {
>             node = currentLayer->get(character);
>             if (!node) {
>@@ -113,12 +115,12 @@ public:
>     {
>         GlyphMapLayer* currentLayer = &m_rootLayer;
> 
>-        const UChar* characters = string.deprecatedCharacters();
>+        auto upconvertedCharacters = StringView(string).upconvertedCharacters();
>         size_t length = string.length();
> 
>         UChar32 character = 0;
>         unsigned clusterLength = 0;
>-        SurrogatePairAwareTextIterator textIterator(characters, 0, length, length);
>+        SurrogatePairAwareTextIterator textIterator(upconvertedCharacters, 0, length, length);
>         while (textIterator.consume(character, clusterLength)) {
>             RefPtr<GlyphMapNode> node = currentLayer->get(character);
>             if (!node)
>diff --git a/Source/WebCore/svg/SVGGlyphRefElement.cpp b/Source/WebCore/svg/SVGGlyphRefElement.cpp
>index 218dcd9fd073fe652e6120ae2f747b2e3afe9fbb..9caa1b85ca9bb50716e1d8bbcccbeb53270b1428 100644
>--- a/Source/WebCore/svg/SVGGlyphRefElement.cpp
>+++ b/Source/WebCore/svg/SVGGlyphRefElement.cpp
>@@ -27,6 +27,7 @@
> #include "SVGParserUtilities.h"
> #include "XLinkNames.h"
> #include <wtf/text/AtomicString.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -66,7 +67,8 @@ bool SVGGlyphRefElement::hasValidGlyphElement(String& glyphName) const
> 
> void SVGGlyphRefElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
> {
>-    const UChar* startPtr = value.string().deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(value.string()).upconvertedCharacters();
>+    const UChar* startPtr = upconvertedCharacters;
>     const UChar* endPtr = startPtr + value.length();
> 
>     // FIXME: We need some error handling here.
>diff --git a/Source/WebCore/svg/SVGLength.cpp b/Source/WebCore/svg/SVGLength.cpp
>index 3cf2d24a431cd5bc6006727cec6452f665e87205..bafd276ff73b4058b1e62eb80d767df076eb4592 100644
>--- a/Source/WebCore/svg/SVGLength.cpp
>+++ b/Source/WebCore/svg/SVGLength.cpp
>@@ -29,9 +29,8 @@
> #include "FloatConversion.h"
> #include "SVGNames.h"
> #include "SVGParserUtilities.h"
>-
> #include <wtf/MathExtras.h>
>-#include <wtf/text/WTFString.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -224,7 +223,8 @@ void SVGLength::setValueAsString(const String& string, ExceptionCode& ec)
>         return;
> 
>     float convertedNumber = 0;
>-    const UChar* ptr = string.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(string).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + string.length();
> 
>     if (!parseNumber(ptr, end, convertedNumber, false)) {
>diff --git a/Source/WebCore/svg/SVGLengthList.cpp b/Source/WebCore/svg/SVGLengthList.cpp
>index 2ba0b556e2e5c493b60668822f7f1c6094d947e0..9a00ebf4358e9e256661d0fddcb6df2a2112a25e 100644
>--- a/Source/WebCore/svg/SVGLengthList.cpp
>+++ b/Source/WebCore/svg/SVGLengthList.cpp
>@@ -31,7 +31,8 @@ void SVGLengthList::parse(const String& value, SVGLengthMode mode)
>     clear();
>     ExceptionCode ec = 0;
> 
>-    const UChar* ptr = value.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(value).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + value.length();
>     while (ptr < end) {
>         const UChar* start = ptr;
>diff --git a/Source/WebCore/svg/SVGNumberList.cpp b/Source/WebCore/svg/SVGNumberList.cpp
>index fd6aebb07317b603fc6125bf9472cfd4062fe109..3c02c1e886390a0cc1ce27690c4a3167fe212bfa 100644
>--- a/Source/WebCore/svg/SVGNumberList.cpp
>+++ b/Source/WebCore/svg/SVGNumberList.cpp
>@@ -31,7 +31,8 @@ void SVGNumberList::parse(const String& value)
>     clear();
> 
>     float number = 0;
>-    const UChar* ptr = value.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(value).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + value.length();
> 
>     // The spec strangely doesn't allow leading whitespace.  We might choose to violate that intentionally. (section 4.1)
>diff --git a/Source/WebCore/svg/SVGParserUtilities.cpp b/Source/WebCore/svg/SVGParserUtilities.cpp
>index aad331344bf0954577c6f41765edfad6c94a046a..a8ba29a423a0b45c03444fbe40f605fd106891e6 100644
>--- a/Source/WebCore/svg/SVGParserUtilities.cpp
>+++ b/Source/WebCore/svg/SVGParserUtilities.cpp
>@@ -26,9 +26,9 @@
> #include "Document.h"
> #include "FloatRect.h"
> #include "SVGPointList.h"
>-
> #include <limits>
> #include <wtf/ASCIICType.h>
>+#include <wtf/text/STringView.h>
> 
> namespace WebCore {
> 
>@@ -164,7 +164,8 @@ bool parseNumber(const UChar*& ptr, const UChar* end, float& number, bool skip)
> 
> bool parseNumberFromString(const String& string, float& number, bool skip)
> {
>-    const UChar* ptr = string.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(string).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + string.length();
>     return genericParseNumber(ptr, end, number, skip) && ptr == end;
> }
>@@ -203,7 +204,9 @@ bool parseNumberOptionalNumber(const String& s, float& x, float& y)
> {
>     if (s.isEmpty())
>         return false;
>-    const UChar* cur = s.deprecatedCharacters();
>+
>+    auto upconvertedCharacters = StringView(s).upconvertedCharacters();
>+    const UChar* cur = upconvertedCharacters;
>     const UChar* end = cur + s.length();
> 
>     if (!parseNumber(cur, end, x))
>@@ -219,7 +222,8 @@ bool parseNumberOptionalNumber(const String& s, float& x, float& y)
> 
> bool parseRect(const String& string, FloatRect& rect)
> {
>-    const UChar* ptr = string.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(string).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + string.length();
>     skipOptionalSVGSpaces(ptr, end);
>     
>@@ -236,7 +240,8 @@ bool pointsListFromSVGData(SVGPointList& pointsList, const String& points)
> {
>     if (points.isEmpty())
>         return true;
>-    const UChar* cur = points.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(points).upconvertedCharacters();
>+    const UChar* cur = upconvertedCharacters;
>     const UChar* end = cur + points.length();
> 
>     skipOptionalSVGSpaces(cur, end);
>@@ -270,7 +275,8 @@ bool parseGlyphName(const String& input, HashSet<String>& values)
>     // FIXME: Parsing error detection is missing.
>     values.clear();
> 
>-    const UChar* ptr = input.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(input).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + input.length();
>     skipOptionalSVGSpaces(ptr, end);
> 
>@@ -367,7 +373,8 @@ static bool parseUnicodeRange(const UChar* characters, unsigned length, UnicodeR
> bool parseKerningUnicodeString(const String& input, UnicodeRanges& rangeList, HashSet<String>& stringList)
> {
>     // FIXME: Parsing error detection is missing.
>-    const UChar* ptr = input.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(input).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + input.length();
> 
>     while (ptr < end) {
>@@ -394,7 +401,8 @@ Vector<String> parseDelimitedString(const String& input, const char seperator)
> {
>     Vector<String> values;
> 
>-    const UChar* ptr = input.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(input).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + input.length();
>     skipOptionalSVGSpaces(ptr, end);
> 
>diff --git a/Source/WebCore/svg/SVGPreserveAspectRatio.cpp b/Source/WebCore/svg/SVGPreserveAspectRatio.cpp
>index 66dd69c90254b2b0b44b87b5b0b39b192d890a50..15b97c2c91422a6448dd8f2fa2ebd13cb22b784f 100644
>--- a/Source/WebCore/svg/SVGPreserveAspectRatio.cpp
>+++ b/Source/WebCore/svg/SVGPreserveAspectRatio.cpp
>@@ -26,7 +26,7 @@
> #include "ExceptionCode.h"
> #include "FloatRect.h"
> #include "SVGParserUtilities.h"
>-#include <wtf/text/WTFString.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -58,7 +58,8 @@ void SVGPreserveAspectRatio::setMeetOrSlice(unsigned short meetOrSlice, Exceptio
> 
> void SVGPreserveAspectRatio::parse(const String& value)
> {
>-    const UChar* begin = value.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(value).upconvertedCharacters();
>+    const UChar* begin = upconvertedCharacters;
>     parseInternal(begin, begin + value.length(), true);
> }
> 
>diff --git a/Source/WebCore/svg/SVGStringList.cpp b/Source/WebCore/svg/SVGStringList.cpp
>index 694eb39927a6fdf9d0853e889880d7b1ca898a0b..a118ae72668cf7c3e750dd35f2e7dfeeb326ec0e 100644
>--- a/Source/WebCore/svg/SVGStringList.cpp
>+++ b/Source/WebCore/svg/SVGStringList.cpp
>@@ -48,7 +48,8 @@ void SVGStringList::parse(const String& data, UChar delimiter)
>     // TODO : more error checking/reporting
>     clear();
> 
>-    const UChar* ptr = data.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(data).upconvertedCharacters();
>+    const UChar* ptr = upconvertedCharacters;
>     const UChar* end = ptr + data.length();
>     while (ptr < end) {
>         const UChar* start = ptr;
>diff --git a/Source/WebCore/svg/SVGTransformList.cpp b/Source/WebCore/svg/SVGTransformList.cpp
>index e3ee718e1de71f980644e1dda5b82087df88e501..11e624dd91c2b28847240a837e7d6ec381924e72 100644
>--- a/Source/WebCore/svg/SVGTransformList.cpp
>+++ b/Source/WebCore/svg/SVGTransformList.cpp
>@@ -74,7 +74,8 @@ String SVGTransformList::valueAsString() const
> 
> void SVGTransformList::parse(const String& transform)
> {
>-    const UChar* start = transform.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(transform).upconvertedCharacters();
>+    const UChar* start = upconvertedCharacters;
>     if (!SVGTransformable::parseTransformAttribute(*this, start, start + transform.length()))
>         clear();
> }
>diff --git a/Source/WebCore/svg/SVGTransformable.cpp b/Source/WebCore/svg/SVGTransformable.cpp
>index a1129d586c6381af049ab76ecb599da3f0452c39..4e156c62289c1523c211eaaa449040e562835eee 100644
>--- a/Source/WebCore/svg/SVGTransformable.cpp
>+++ b/Source/WebCore/svg/SVGTransformable.cpp
>@@ -28,6 +28,7 @@
> #include "SVGNames.h"
> #include "SVGParserUtilities.h"
> #include "SVGTransformList.h"
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -171,7 +172,8 @@ static inline bool parseAndSkipType(const UChar*& currTransform, const UChar* en
> SVGTransform::SVGTransformType SVGTransformable::parseTransformType(const String& typeString)
> {
>     unsigned short type = SVGTransform::SVG_TRANSFORM_UNKNOWN;
>-    const UChar* characters = typeString.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(typeString).upconvertedCharacters();
>+    const UChar* characters = upconvertedCharacters;
>     parseAndSkipType(characters, characters + typeString.length(), type);
>     return static_cast<SVGTransform::SVGTransformType>(type);
> }
>diff --git a/Source/WebCore/svg/SVGViewSpec.cpp b/Source/WebCore/svg/SVGViewSpec.cpp
>index 2985ab1d16f45bf95ad72205df47618e3f8405a5..9822bd1dfba76ca6880a5224a5b67a60a5aa2478 100644
>--- a/Source/WebCore/svg/SVGViewSpec.cpp
>+++ b/Source/WebCore/svg/SVGViewSpec.cpp
>@@ -207,7 +207,8 @@ static const UChar viewTargetSpec[] =  {'v', 'i', 'e', 'w', 'T', 'a', 'r', 'g',
> 
> bool SVGViewSpec::parseViewSpec(const String& viewSpec)
> {
>-    const UChar* currViewSpec = viewSpec.deprecatedCharacters();
>+    auto upconvertedCharacters = StringView(viewSpec).upconvertedCharacters();
>+    const UChar* currViewSpec = upconvertedCharacters;
>     const UChar* end = currViewSpec + viewSpec.length();
> 
>     if (currViewSpec >= end || !m_contextElement)
>diff --git a/Source/WebCore/svg/SVGZoomAndPan.h b/Source/WebCore/svg/SVGZoomAndPan.h
>index 4429728b9f7967253debfcc4b837e6f16a754ae2..490ba9ab4e7eb14ee1a660f6579d7c8d24862a8b 100644
>--- a/Source/WebCore/svg/SVGZoomAndPan.h
>+++ b/Source/WebCore/svg/SVGZoomAndPan.h
>@@ -24,6 +24,7 @@
> #include "QualifiedName.h"
> #include "SVGNames.h"
> #include <wtf/HashSet.h>
>+#include <wtf/text/StringView.h>
> 
> namespace WebCore {
> 
>@@ -59,7 +60,8 @@ public:
>     {
>         ASSERT(target);
>         if (name == SVGNames::zoomAndPanAttr) {
>-            const UChar* start = value.string().deprecatedCharacters();
>+            auto upconvertedCharacters = StringView(value.string()).upconvertedCharacters();
>+            const UChar* start = upconvertedCharacters;
>             const UChar* end = start + value.length();
>             SVGZoomAndPanType zoomAndPan = SVGZoomAndPanUnknown;
>             parseZoomAndPan(start, end, zoomAndPan);
>diff --git a/Source/WebCore/xml/XMLHttpRequest.cpp b/Source/WebCore/xml/XMLHttpRequest.cpp
>index e3de46d71459d911e797aff3faf3a65d55a534bb..b6eab758e754d19411085320ca3d73500bf82ad0 100644
>--- a/Source/WebCore/xml/XMLHttpRequest.cpp
>+++ b/Source/WebCore/xml/XMLHttpRequest.cpp
>@@ -619,7 +619,7 @@ void XMLHttpRequest::send(Document* document, ExceptionCode& ec)
> 
>         // FIXME: this should use value of document.inputEncoding to determine the encoding to use.
>         TextEncoding encoding = UTF8Encoding();
>-        m_requestEntityBody = FormData::create(encoding.encode(body.deprecatedCharacters(), body.length(), EntitiesForUnencodables));
>+        m_requestEntityBody = FormData::create(encoding.encode(body, EntitiesForUnencodables));
>         if (m_upload)
>             m_requestEntityBody->setAlwaysStream(true);
>     }
>@@ -646,7 +646,7 @@ void XMLHttpRequest::send(const String& body, ExceptionCode& ec)
>             m_requestHeaders.set("Content-Type", contentType);
>         }
> 
>-        m_requestEntityBody = FormData::create(UTF8Encoding().encode(body.deprecatedCharacters(), body.length(), EntitiesForUnencodables));
>+        m_requestEntityBody = FormData::create(UTF8Encoding().encode(body, EntitiesForUnencodables));
>         if (m_upload)
>             m_requestEntityBody->setAlwaysStream(true);
>     }
>diff --git a/Source/WebCore/xml/XSLStyleSheetLibxslt.cpp b/Source/WebCore/xml/XSLStyleSheetLibxslt.cpp
>index 1192bf030242a56a0460bb9c71e803ea478dfaba..7a17fbd47551a21060a82c6026173a70823ba86b 100644
>--- a/Source/WebCore/xml/XSLStyleSheetLibxslt.cpp
>+++ b/Source/WebCore/xml/XSLStyleSheetLibxslt.cpp
>@@ -33,7 +33,6 @@
> #include "XMLDocumentParserScope.h"
> #include "XSLImportRule.h"
> #include "XSLTProcessor.h"
>-
> #include <libxml/uri.h>
> #include <libxslt/xsltutils.h>
> 
>@@ -148,7 +147,8 @@ bool XSLStyleSheet::parseString(const String& string)
> 
>     XMLDocumentParserScope scope(cachedResourceLoader(), XSLTProcessor::genericErrorFunc, XSLTProcessor::parseErrorFunc, console);
> 
>-    const char* buffer = reinterpret_cast<const char*>(string.deprecatedCharacters());
>+    auto upconvertedCharacters = StringView(string).upconvertedCharacters();
>+    const char* buffer = reinterpret_cast<const char*>(upconvertedCharacters.get());
>     int size = string.length() * sizeof(UChar);
> 
>     xmlParserCtxtPtr ctxt = xmlCreateMemoryParserCtxt(buffer, size);

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Attachments on bug 130318: 226889 | 226927 | 226928 | 226929 | 226944 | 226949 | 226954 | 226964 | 227007 | 227047 | 227048 | 227058