REGRESSION (264795@main) Twitter.com: Video blank/black while scrolling
<rdar://problem/110320059>
Pull request: https://github.com/WebKit/WebKit/pull/14740
Committed 264949@main (580bf6c28d2b): <https://commits.webkit.org/264949@main> Reviewed commits have been landed. Closing PR #14740 and removing active labels.