[slightlyoff/ServiceWorker] should FetchEvent.request.cache reflect non-fetch browser cache controls? (#875)

Currently the Request.cache attribute reflects the request's RequestCache setting.  The current specs are a bit vague on this point.  Only `fetch()` actually sets this, but the browser can bypass the http cache for other reasons.  For example, if a user presses the refresh button causing the page to reload with http cache revalidation, should the corresponding FetchEvent.request.cache be set to `no-cache`.

I believe we should reflect these browser cache settings on all FetchEvent's whether they come from `fetch()` or another source.

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