If a script calls exitFullscreen() on an element which is not the current full screen element, it will hit the ASSERT in the legacy full screen media case.
Created attachment 88710 [details]
Attachment 88710 [details] did not build on chromium:
Build output: http://queues.webkit.org/results/8342680
Created attachment 88733 [details]
Missing parenthesis reinserted.
Committed r83332: <http://trac.webkit.org/changeset/83332>