check-webkit-style attempts to diff against the remote versions of the current branch. This is challenging because it's possible for different remotes to have different versions of the same branch, usually because one remote has a more up to date version than another. We should leverage the branch point and repository.branches_for to only include branch references from remotes which contain the branch point.
<rdar://problem/102376829>
Pull request: https://github.com/WebKit/WebKit/pull/6521
Committed 256710@main (10e8d00cbce3): <https://commits.webkit.org/256710@main> Reviewed commits have been landed. Closing PR #6521 and removing active labels.
Committed 252432.831@safari-7614-branch (95d5bbb634bd): <https://commits.webkit.org/252432.831@safari-7614-branch> Reviewed commits have been landed. Closing PR #205 and removing active labels.