ViewUpdate*, Event*, WebInspectorInterruptDispatcher should be MessageReceivers These are never destroyed singletons, but being WorkQueueMessageReceivers these must be refcounted which does not make sense.
<rdar://problem/99816958>
Pull request: https://github.com/WebKit/WebKit/pull/4254
Committed 254753@main (bb50e5a9e92c): <https://commits.webkit.org/254753@main> Reviewed commits have been landed. Closing PR #4254 and removing active labels.