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

>      }
>  
> -    this.releaseLock();
> -    return this._encapsulatedReadableStream.cancel(reason, ...args);
> +    // Bypass lock check.
> +    return CancelReadableStream(this._encapsulatedReadableStream, reason, ...args);

I think it is OK to stop passing any args now since it is not a direct delegation to a possibly-overridden `.cancel` method.

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