Re: [ServiceWorker] Foreign fetch (#751)

1. I think it's a very bad idea to reuse the `fetch` event. I don't think we should do that.
2. We shouldn't use `withCredentials` since that is XMLHttpRequest terminology.
3. If the request is without credentials, this also needs to affect the used service worker in some way. Otherwise there's still ambient authority leakage.

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https://github.com/slightlyoff/ServiceWorker/pull/751#issuecomment-165042371