Re: [streams] Have each of the stream and reader hold promises (#277)

> @@ -1,7 +1,8 @@
>  var assert = require('assert');
>  import * as helpers from './helpers';
> -import { AcquireExclusiveStreamReader, CallReadableStreamPull, CloseReadableStream, CreateReadableStreamCloseFunction,
> -  CreateReadableStreamEnqueueFunction, CreateReadableStreamErrorFunction, IsReadableStream, ReadFromReadableStream,
> +import { AcquireExclusiveStreamReader, CallReadableStreamPull,

Nit: alphabetize and wrap to 120 chars

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