WebValidationMessageClient should store WeakPtr<WebPage> instead of a raw reference.
Pull request: https://github.com/WebKit/WebKit/pull/16727
Committed 266937@main (305367d61f5b): <https://commits.webkit.org/266937@main> Reviewed commits have been landed. Closing PR #16727 and removing active labels.
<rdar://problem/113945908>