Re: [streams] Merge ReadableByteStream into ReadableStream (#430)

```
let bytesRead;
if (r) {
  bytesRead = socket.readInto(r.view.buffer, r.view.byteOffset, r.view.byteLength);
  r.respond();
} else {
  const buffer = new ArrayBuffer(DEFAULT_WINDOW_SIZE);
  bytesRead = socket.readInto(buffer, 0, DEFAULT_WINDOW_SIZE);
  controller.enqueue(buffer);
}
```

`bytesRead` is not used, is it correct?

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https://github.com/whatwg/streams/pull/430#issuecomment-192089944