Add fast path for Element::removeShadowRoot(), for the common case where the element has no shadow root.
Pull request: https://github.com/WebKit/WebKit/pull/11314
Committed 261473@main (9bacb3aad0e6): <https://commits.webkit.org/261473@main> Reviewed commits have been landed. Closing PR #11314 and removing active labels.
<rdar://problem/106523358>