Remove unused processDidTransitionTo{Foreground,Background} IPC
Created attachment 434291 [details] Patch
ccing chris in case I'm missing some highly non-obvious reason these are here
<rdar://problem/81464646>
Committed r280611 (240229@main): <https://commits.webkit.org/240229@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 434291 [details].