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

@domenic yes, returning an empty string seems more consistent to me.

If we can return an empty string in that case, I would propose the following for Request.

- All actions (in @tyoshino's table) will fail when the stream is locked to a reader.
- All actions except `read()` will take an exclusive lock.
- `new Request` and `fetch()` will set `unusable flag` on the Request.
- All actions will fail when Body's `unusable flag` is set.
- `new Request` and `fetch()` will fail when Body is modified (i.e. non empty data is read from it).

These rules are moderately simple and cover @tyoshino's table requirements except the "text() on a dirty closed body" case.

(Note: `unusable flag` introduced here need careful consideration. What happens when accessing the stream of a body whose `unusable flag` is set?)

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