[whatwg/streams] Port remaining writable-stream.js tests to wpt (#536)

This is an initial port of the 3 remaining tests from
test/writable-stream.js to web-platform-tests.

Minimal changes have been made. A followup commit will change the new
tests from async_test to promise_test and use a more idiomatic style.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/536

-- Commit Summary --

  * Port remaining writable-stream.js tests to wpt

-- File Changes --

    D reference-implementation/test/writable-stream.js (105)
    M reference-implementation/to-upstream-wpts/writable-streams/close.js (106)

-- Patch Links --

https://github.com/whatwg/streams/pull/536.patch
https://github.com/whatwg/streams/pull/536.diff

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