Re: [streams-tests] Update WritableStream tests (#4587)

Notifying @calvaris, @domenic, @tyoshino, @wanderview, @youennf, and @yutakahirano. *([Learn how reviewing works](https://github.com/w3c/web-platform-tests/blob/master/README.md#test-review).)*

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4587#issuecomment-274107695

Received on Friday, 20 January 2017 15:59:31 UTC