Decrease PiP flicker by not removing window prematurely.
Created attachment 280633 [details] Patch
Created attachment 280634 [details] Patch
rdar://problem/19052639
Comment on attachment 280634 [details] Patch Clearing flags on attachment: 280634 Committed r202006: <http://trac.webkit.org/changeset/202006>
All reviewed patches have been landed. Closing bug.