[Web Animations] Crash when setting an animation style on an existing animation that had its effect set to null
Created attachment 345654 [details] Patch
Comment on attachment 345654 [details] Patch Attachment 345654 [details] did not pass win-ews (win): Output: https://webkit-queues.webkit.org/results/8639069 New failing tests: webanimations/setting-css-animation-timing-property-via-style-after-clearing-effect.html
Created attachment 345686 [details] Archive of layout-test-results from ews204 for win-future The attached test failures were seen while running run-webkit-tests on the win-ews. Bot: ews204 Port: win-future Platform: CYGWIN_NT-6.1-2.9.0-0.318-5-3-x86_64-64bit
Committed r234165: <https://trac.webkit.org/changeset/234165>
<rdar://problem/42551804>