[whatwg/fetch] Use of response's cache state (#376)

Service worker has been using the response's cache state to check if the response hit the network or gotten from the cache: https://github.com/whatwg/fetch/commit/8d343bbcefc952fedc22e4020518acf52548a483#commitcomment-18789695.

Please consider either restore the cache state concept or anything similar that service worker can reference to.

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