Add notifyd message filter in the WebContent process' sandbox on macOS.
<rdar://73987767>
Created attachment 420907 [details] Patch
Created attachment 420908 [details] Patch
Comment on attachment 420908 [details] Patch r=me
Committed r273151: <https://commits.webkit.org/r273151> All reviewed patches have been landed. Closing bug and clearing flags on attachment 420908 [details].