Avoid ElementIdentifier-related work under Element::removedFromAncestor() since it is a hot function and we want to do as little work as possible in there.
Pull request: https://github.com/WebKit/WebKit/pull/1032
Committed r294931 (251042@main): <https://commits.webkit.org/251042@main> Reviewed commits have been landed. Closing PR #1032 and removing active labels.
<rdar://problem/94017434>