Resync webmessaging WPT tests from upstream.
Created attachment 433448 [details] Patch
Comment on attachment 433448 [details] Patch r=me
Committed r279894 (239645@main): <https://commits.webkit.org/239645@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 433448 [details].
<rdar://problem/80542213>