Re: [whatwg/streams] Align WritableStream structure with ReadableStream structure (#462)

> @@ -35,6 +35,18 @@ class WritableStream {
>      return IsWritableStreamLocked(this);
>    }
>  
> +  abort(reason) {
> +    if (IsWritableStream(this) === false) {
> +      throw Promise.reject(new TypeError('WritableStream.prototype.abort can only be used on a WritableStream'));
> +    }
> +
> +    if (IsWritableStreamLocked(this) === true) {
> +      throw Promise.reject(new TypeError('Cannot abort a stream that already has a reader'));

Thanks. Fixed and added a test.

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