The Clear-Site-Data HTTP header should obey origin partition. If shouldn't be possible for an iframe of origin A under top origin B to be able to clear site data from top origin A (and vice-versa). Our storages are partitioned and the request to clear site data should respect that.
Pull request: https://github.com/WebKit/WebKit/pull/9053
Committed 259466@main (472954140c35): <https://commits.webkit.org/259466@main> Reviewed commits have been landed. Closing PR #9053 and removing active labels.
<rdar://problem/104727671>