Various websites (often involving video fullscreen) trigger a web content crash via the MESSAGE_CHECK in RemoteScrollingCoordinatorProxyIOS::establishLayerTreeScrollingRelations()
<rdar://108204370>
Pull request: https://github.com/WebKit/WebKit/pull/13351
Committed 263590@main (77bb4783cf75): <https://commits.webkit.org/263590@main> Reviewed commits have been landed. Closing PR #13351 and removing active labels.