[whatwg/streams] Run idlharness tests on reference implementation (#1046)

This enables the idlharness tests to run on the reference implementation, as details in [my comment on #1044](https://github.com/whatwg/streams/issues/1044#issuecomment-647189179).

Fixes #1044
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1046

-- Commit Summary --

  * Update WPT
  * Run idlharness tests on reference implementation

-- File Changes --

    M reference-implementation/package.json (2)
    M reference-implementation/run-web-platform-tests.js (22)
    M reference-implementation/web-platform-tests (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/1046.patch
https://github.com/whatwg/streams/pull/1046.diff

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