When invalidating fullscreen, cancel instead of stop optimizedFullscfreen.
Created attachment 242334 [details] Patch
rdar://problem/18957744
Created attachment 242902 [details] Patch for landing.
Created attachment 242903 [details] Patch for landing.
Comment on attachment 242903 [details] Patch for landing. Clearing flags on attachment: 242903 Committed r177017: <http://trac.webkit.org/changeset/177017>