Re: [w3c/ServiceWorker] cache.match() and COEP (#1490)

I'm fairly confident both chrome/firefox store and retrieve the full internal headers for opaque responses.  In addition, both browsers do some amount of eager reading of the body data under different circumstances.

It would be possible to fix all that for COEP, but its much safer to never allow these Response objects to enter the child/renderer process at all.

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