Re: [ServiceWorker] window.fetch (#581)

`Response.headers` is ok. Same as XHR, they're filtered.

The step checking simpleness of the given method and the special guard `request-no-CORS` prevent non-simple requests from being issued using `RequestInit.mode=="no-cors"`. So, this is ok.

Now I've done reviewing all the attributes. It seems we need to take care of `RequestInit.cache` and `Response.type`, but except for them, it seems we're ready to expose Fetch API to window and (shared)worker.

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