If the base-commit for a PR doesn't belong to origin, then we should make the PR against the remote the base-commit belongs to.
<rdar://problem/96914116>
Pull request: https://github.com/WebKit/WebKit/pull/2393
Committed 252475@main (c85ae4314641): <https://commits.webkit.org/252475@main> Reviewed commits have been landed. Closing PR #2393 and removing active labels.