[w3c/ServiceWorker] Behavior for accessing cache storage in opaque origins (#1484)

The spec doesn't currently describe if there should be any special behavior when trying to use the cache storage API in an opaque origin. From some [research](https://github.com/WICG/native-file-system/issues/77#issuecomment-550509998) somebody did, it appears both Chrome and Firefox currently throw when accessing self.caches from an opaque origin. If that is indeed the desired behavior https://w3c.github.io/ServiceWorker/#global-caches should probably be updated to actually document that behavior?

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https://github.com/w3c/ServiceWorker/issues/1484