Give URLKeepingBlobAlive a top-origin SecurityOriginData
<rdar://problem/104704879>
Pull request: https://github.com/WebKit/WebKit/pull/9184
Committed 260266@main (6f0e501e8e36): <https://commits.webkit.org/260266@main> Reviewed commits have been landed. Closing PR #9184 and removing active labels.