[whatwg/streams] Change 3 tests from async_test to promise_test (#537)

Change 3 WritableStream web-platform-tests from async_test to
promise_test. Also make them more idiomatic, and use
recordingWritableStream to avoid having assert statements inside sink
methods.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/537

-- Commit Summary --

  * Change 3 tests from async_test to promise_test

-- File Changes --

    M reference-implementation/to-upstream-wpts/writable-streams/close.https.html (1)
    M reference-implementation/to-upstream-wpts/writable-streams/close.js (121)

-- Patch Links --

https://github.com/whatwg/streams/pull/537.patch
https://github.com/whatwg/streams/pull/537.diff

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