We're using a raw reference for WebFrameProxy, which we should move away from.
Pull request: https://github.com/WebKit/WebKit/pull/12841
Committed 263066@main (39053215a8c0): <https://commits.webkit.org/263066@main> Reviewed commits have been landed. Closing PR #12841 and removing active labels.
<rdar://problem/108186307>