WebVideoFullscreenManagerProxy::invalidate is called when the page is about to close, so it should clear the WebVideoFullscreenModel and WebVideoFullscreenChangeObserver.
rdar://problem/18904411
Created attachment 242074 [details] Proposed patch.
Comment on attachment 242074 [details] Proposed patch. Clearing flags on attachment: 242074 Committed r176487: <http://trac.webkit.org/changeset/176487>
All reviewed patches have been landed. Closing bug.