Temporarily stop using RunningBoard for the foreground process assertion. On recent iOS builds, there are issues where this assertion can time out after 30 seconds, even though the process is still foreground.
<rdar://problem/62535822>
Created attachment 397984 [details] Patch
Committed r260912: <https://trac.webkit.org/changeset/260912> All reviewed patches have been landed. Closing bug and clearing flags on attachment 397984 [details].