Events sent from the UI process expect a returning DidReceiveEvent() call to indicate that the event has been handled or not. Change this so that these events are sent using sendWithAsyncReply and the completion handler calls didReceiveEvent().
<rdar://problem/115064837>
Pull request: https://github.com/WebKit/WebKit/pull/17492
Committed 267849@main (8683b68595b8): <https://commits.webkit.org/267849@main> Reviewed commits have been landed. Closing PR #17492 and removing active labels.