Since the blob store in the Network process holds the appropriate PolicyContainer per the spec it's more natural to handle PolicyContainer inheritance in that process as opposed to the WebContent process.
<rdar://problem/100813396>
Pull request: https://github.com/WebKit/WebKit/pull/5039
Committed 255352@main (73a8787f1d06): <https://commits.webkit.org/255352@main> Reviewed commits have been landed. Closing PR #5039 and removing active labels.