Re: [streams] Getting errored/closed reader, Auto-releasing reader, Forcible cancel() on a stream (#297)

Right, there is a lot of discussion about how to do fetch cancellation, I think in the service worker repo. I think it is OK to (eventually) have multiple possibilities as long as they all related together. E.g. maybe `fetchPromise.cancel()` is defined as doing either (1) internal method to cancel request before headers are received; or (2) canceling the stream, and maybe (2) is exposed directly (since it is more general).

Hmm. But if we allow `fetchPromise.cancel()` (or the canceller approach) then we have to decide what it does when the stream is locked. So that comes back to our original problem.

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