[whatwg/streams] Always resolve tee's cancel promise after reaching end of stream (#1039)

Fixes #1038.

- [ ] At least two implementers are interested (and none opposed):
   * …
   * …
- [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/master/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chrome: …
   * Firefox: …
   * Safari: …

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1039


-- Commit Summary --

  * Always resolve tee's cancel promise after reaching end of stream
  * Use promise helpers in ReadableStreamTee
  * Update WPT (WIP)

-- File Changes --

    M index.bs (1)
    M reference-implementation/lib/abstract-ops/readable-streams.js (10)
    M reference-implementation/web-platform-tests (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/1039.patch

https://github.com/whatwg/streams/pull/1039.diff


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