Re: [streams] Add IsReadableStreamDisturbed predicate (#385)

The f2f agreement suggests a stream should be disturbed  when read even if it is closed (See https://github.com/yutakahirano/fetch-with-streams/pull/48#issuecomment-125172550). In order to achieve that, there are two ways:

1. Auto-released reader makes the stream disturbed.
1. Remove the auto-release mechanism.

My opinion is that the latter is less evil.

> Are we just dropping automatic unlocking on stream close?

And on stream error.

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