Now that we go through main thread for registration change state and directly to worker thread for fetch events, the assert is no longer true.
While we might want to go off the main thread for registration change state, we might want to remove the assert in the meantime.
*** Bug 242229 has been marked as a duplicate of this bug. ***
Pull request: https://github.com/WebKit/WebKit/pull/2077
Committed 252152@main (57b6a2102bd2): <https://commits.webkit.org/252152@main>
Reviewed commits have been landed. Closing PR #2077 and removing active labels.