Re: [ServiceWorker] Backpressure on fetch integrated with Streams (#452)

To be clear, I don't really care what we do here, but I'd like the invariants in the specification to be preserved (around the "used flag").

We expose `bodyUsed` so developers can detect whether serialize methods (`text()` et al), `clone()` methods, and constructing a `Request` based on another `Request`, might fail. Not exposing it leads to try/catch or worse (serialize methods return promises).

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