We are always setting the requested url as the first party for cookies, instead of the document URL. Nowadays we don't need to set the first party for cookies in the request from the media backend.
Pull request: https://github.com/WebKit/WebKit/pull/6588
Committed 256829@main (10077398852e): <https://commits.webkit.org/256829@main> Reviewed commits have been landed. Closing PR #6588 and removing active labels.
<rdar://problem/102508786>