Re: [whatwg/dom] AbortController, AbortSignal, and garbage collection (#920)

I just realized that if we have #911, this could be simplified(?) to:
```javascript
  // 3. Otherwise, add the following abort steps to parentSignal:
  parentSignal.addEventListener('abort',  () => {
    // 3.1. Signal abort on followingSignal.
    followingAbortController.abort();
  }, {
    once: true,
    signal: followingAbortController.signal
  });
```
It's abort signals all the way down! 😆

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