Removes the one case where we had multiple frames with the same ID, also fixes rdar://101309133
Pull request: https://github.com/WebKit/WebKit/pull/5526
Committed 255719@main (636ad3860681): <https://commits.webkit.org/255719@main> Reviewed commits have been landed. Closing PR #5526 and removing active labels.
Re-opened since this is blocked by bug 246757