webaudio/silence-after-playback.html [ Failure Timeout Pass ]

This test was passing fine until r234983 when it started failing sometimes because of a different audio output than expected. Since r235142 it started to timeout as well quite often.

The expected audio can be checked here:

https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r235732%20(8061)/webaudio/silence-after-playback-expected.wav

and the result is here:

https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20(Tests)/r235732%20(8061)/webaudio/silence-after-playback-actual.wav

And if you check them, it seems that the problem is that we are playing the sound on loop: the expected has a sound and then silence, and the actual has the sound played 3 times with no silence, seems that it's player in loop instead of just once.