Keyboard remains on full screen video view after back from PiP
<rdar://problem/64616004>
Created attachment 404194 [details] Patch
Comment on attachment 404194 [details] Patch Patch looks good.
Committed r264329: <https://trac.webkit.org/changeset/264329> All reviewed patches have been landed. Closing bug and clearing flags on attachment 404194 [details].