Re: [ServiceWorker] fetch() cache control options (#398)

I'm reviewing `Request`'s parameters from security/privacy point of view in the context of #581. I'm concerned that fetch() with the `cache` parameter set to e.g. the `only-if-cached` option may cause privacy leak.

Like CSS :visited (http://dbaron.org/mozilla/visited-privacy), could it be abused to probe if a certain site was visited by the user?

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