Crashes in -[WebProcessPoolCocoa registerNotificationObservers] after 255941@main
<rdar://problem/101563115>
Pull request: https://github.com/WebKit/WebKit/pull/5779
Committed 255990@main (1ac5e9948225): <https://commits.webkit.org/255990@main> Reviewed commits have been landed. Closing PR #5779 and removing active labels.