[whatwg/fetch] propagate request URL list through service workers (#1335)

Similar to #1321, we also need to propagate the request [URL list](https://fetch.spec.whatwg.org/#concept-request-url-list) through a service worker `evt.respondWith(fetch(evt.request))`.  This is necessary to send the proper values for origin, sec-fetch-site, samesite cookies, etc when a request has redirected through a cross-origin url.

This is related to the collection of topics discussed at w3c/ServiceWorker#1604.

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