InvisibleAutoplay restriction should be lifted when unmuting a video element that was muted then made invisible
<rdar://101682623>
Pull request: https://github.com/WebKit/WebKit/pull/9436
Committed 259744@main (44f6600b0181): <https://commits.webkit.org/259744@main> Reviewed commits have been landed. Closing PR #9436 and removing active labels.