Re: [whatwg/streams] "Set this.[[associatedReadableByteStreamControll..." (#780)

We do need to check, otherwise respond() will try to access fields in `controller` without checking its type.

An oddity is that is doesn't appear to be necessary to verify that `view` actually is a view. It might be confusing that `respondWithNewView()` checks but the constructor doesn't. But in the interests of brevity I plan to leave the unnecessary test out.

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