[whatwg/streams] Eliminate usages of async_test (#534)

Replace all usages of async_test in the wpt writable-streams tests with
promise_test. promise_test is easier to work with than async_test.

Also remove the 'a' from close('a') (it did nothing).
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/534

-- Commit Summary --

  * Eliminate usages of async_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 (33)
    M reference-implementation/to-upstream-wpts/writable-streams/start.https.html (1)
    M reference-implementation/to-upstream-wpts/writable-streams/start.js (43)
    M reference-implementation/to-upstream-wpts/writable-streams/write.https.html (1)
    M reference-implementation/to-upstream-wpts/writable-streams/write.js (99)

-- Patch Links --

https://github.com/whatwg/streams/pull/534.patch
https://github.com/whatwg/streams/pull/534.diff

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