SharedWorker referrer policy should default to its context referrer policy if none is provided in its script http response
<rdar://problem/114625126>
Pull request: https://github.com/WebKit/WebKit/pull/17183
Committed 267405@main (d1c532b691d6): <https://commits.webkit.org/267405@main> Reviewed commits have been landed. Closing PR #17183 and removing active labels.