The following layout test is flaky on Mountain Lion http/tests/media/track/track-webvtt-slow-loading-2.html
On Friday, we discussed how it's almost certainly caused by http/tests/media/hls/video-controls-live-stream.html, which crashes because of <rdar://problem/12598781> (fixed in Mavericks). Who is going to skip that test on Mountain Lion?
Committed r168336: <http://trac.webkit.org/changeset/168336>