We want a WebFrameProxy to have a member to retain the WebProcessProxy. We can't do that if the WebProcessProxy owns the WebFrameProxy.
<rdar://problem/100782843>
Pull request: https://github.com/WebKit/WebKit/pull/5002
Committed 255346@main (a34a1f77cf51): <https://commits.webkit.org/255346@main> Reviewed commits have been landed. Closing PR #5002 and removing active labels.