Move ProcessThrottler to AuxiliaryProcessProxy
<rdar://problem/122708925>
Pull request: https://github.com/WebKit/WebKit/pull/24205
Committed 275195@main (b0938086a540): <https://commits.webkit.org/275195@main> Reviewed commits have been landed. Closing PR #24205 and removing active labels.
Re-opened since this is blocked by bug 269964
Pull request: https://github.com/WebKit/WebKit/pull/25014
Committed 275497@main (b3da4ad472fe): <https://commits.webkit.org/275497@main> Reviewed commits have been landed. Closing PR #25014 and removing active labels.
Reopened Bugzilla. "Broke multiple builds", tracking revert in https://bugs.webkit.org/show_bug.cgi?id=270308.
Pull request: https://github.com/WebKit/WebKit/pull/25315
Committed 275528@main (868e634960d5): <https://commits.webkit.org/275528@main> Reviewed commits have been landed. Closing PR #25315 and removing active labels.