[streams] Fixed test about cancelling a released reader, promise should reject. (#394)

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

  https://github.com/whatwg/streams/pull/394

-- Commit Summary --

  * Fixed test about cancelling a released reader, promise should reject.

-- File Changes --

    M reference-implementation/test/readable-stream-reader.js (6)

-- Patch Links --

https://github.com/whatwg/streams/pull/394.patch
https://github.com/whatwg/streams/pull/394.diff

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https://github.com/whatwg/streams/pull/394