Forward notifications to the WebContent processes. These notifications are being observed in the WebContent process, which has been shown by telemetry.
<rdar://problem/127511384>
Pull request: https://github.com/WebKit/WebKit/pull/28245
Committed 278508@main (2a0d601bd768): <https://commits.webkit.org/278508@main> Reviewed commits have been landed. Closing PR #28245 and removing active labels.