Re: [ServiceWorker] spec should be more explicit about accessing internal body on opaque Responses (#710)

@wanderview see https://github.com/domenic/cancelable-promise/issues/4#issuecomment-118366076 for some of the concerns with altering opaque responses. They don't necessarily apply here, but I'm still deeply skeptical of allowing such things. E.g., for one, you shouldn't be able to tell if an opaque response has a body or not.

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