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

@wanderview ReadableStream has "exclusive reader" concept https://streams.spec.whatwg.org/#reader-class that corresponds to `.locked` in my text. If we use `.bodyConsumed` as `used flag`, we also use `.locked`. Then any other reader cannot read the body, so I think the existing behavior will be preserved (though the spec needs to be updated).

Note: I'm not fully convinced to use `.bodyConsumed`. https://github.com/slightlyoff/ServiceWorker/issues/452#issuecomment-56145980 and https://github.com/slightlyoff/ServiceWorker/issues/452#issuecomment-56147654 look also reasonable as I said before.


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