Removed the 50ms rescheduling timeout from callOnMainThread
Created attachment 402652 [details] Patch
Looks like the EWS mac-debug-wk1 failure in fullscreen/video-inside-flex-item.html is not new, so I will ignore it.
Committed r263461: <https://trac.webkit.org/changeset/263461> All reviewed patches have been landed. Closing bug and clearing flags on attachment 402652 [details].
<rdar://problem/64705949>
<rdar://problem/64705951>