Re: [whatwg/streams] sink.abort() can be called during sink.start() (#683)

```javascript
promise_test(() => {
  let resolveStart;
  const ws = recordingWritableStream({
    start() {
      return new Promise(resolve => {
        resolveStart = resolve;
      });
    }
  });
  const abortPromise = ws.abort('done');
  return flushAsyncEvents().then(() => {
    assert_array_equals(ws.events, [], 'abort() should not be called during start()');
    resolveStart();
    return abortPromise.then(() => {
      assert_array_equals(ws.events, ['abort', 'done'], 'abort() should be called after start() is done');
    });
  });
}, 'abort() should not be called until start() is done');
```

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