REGRESSION(264306@main) [Cocoa] Moving to next video on YouTube.com while in PiP resizes video contents incorrectly
<rdar://problem/110026753>
Pull request: https://github.com/WebKit/WebKit/pull/14554
Committed 264795@main (ab7221357173): <https://commits.webkit.org/264795@main> Reviewed commits have been landed. Closing PR #14554 and removing active labels.