[w3c/ServiceWorker] Match Service Worker Registration should assert same-origin? (#1118)

It's non-obvious from reading https://w3c.github.io/ServiceWorker/#scope-match-algorithm that `clientURL` can't match a cross-origin service worker registration. AFAICT it relies on URLs serializing with a slash at the end. Can Step 5 assert the `matchingScope` is same-origin with `clientURL`?

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https://github.com/w3c/ServiceWorker/issues/1118