Re: [streams] Byte stream update, including reference implementation (#361)

> +      CloseReadableByteStreamReader(this);
> +    }
> +  }
> +}
> +
> +function CallPull(controller) {
> +  const source = controller._underlyingByteSource;
> +
> +  const pullFunction = source['pull'];
> +  if (pullFunction === undefined) {
> +    return;
> +  }
> +
> +  const stream = controller._controlledReadableByteStream;
> +
> +  if (typeof pullFunction !== 'function') {

I think these can be omitted. If it's not a function trying to call it will fail, so you can just use the catch block.

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