[iOS] Videos do not enter fullscreen on trailers.apple.com
<rdar://problem/108332808>
Pull request: https://github.com/WebKit/WebKit/pull/14956
Committed 265207@main (68f1d51e13e7): <https://commits.webkit.org/265207@main> Reviewed commits have been landed. Closing PR #14956 and removing active labels.