Exception being thrown in [WebMainThreadInvoker forwardInvocation] should be autoreleased. I got this wrong in r273194.
Created attachment 435455 [details] Patch
Comment on attachment 435455 [details] Patch r=me
Committed r280999 (240493@main): <https://commits.webkit.org/240493@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 435455 [details].
<rdar://problem/81875685>