webaudio/audiobuffersource-loop-points.html always times out
https://bugs.webkit.org/show_bug.cgi?id=119467

Skip this test.

* platform/mac-wk2/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@153690 268f45cc-cd09-0410-ab3c-d52691b4dbfc