Invalidate WebVideoFullscreenManager when WebPage is destroyed.
Created attachment 313843 [details] Patch
rdar://problem/32969161
Investigating media/controls/ipad/close-page-with-picture-in-picture-video-assertion-failure.html crash to see if it is related.
Comment on attachment 313843 [details] Patch Attachment 313843 [details] did not pass ios-sim-ews (ios-simulator-wk2): Output: http://webkit-queues.webkit.org/results/4001435 New failing tests: media/controls/ipad/close-page-with-picture-in-picture-video-assertion-failure.html
Created attachment 313850 [details] Archive of layout-test-results from ews123 for ios-simulator-wk2 The attached test failures were seen while running run-webkit-tests on the ios-sim-ews. Bot: ews123 Port: ios-simulator-wk2 Platform: Mac OS X 10.12.5
Created attachment 313867 [details] Patch for landing.
Comment on attachment 313867 [details] Patch for landing. Clearing flags on attachment: 313867 Committed r218822: <http://trac.webkit.org/changeset/218822>