Re: [fetch] Aborting a fetch (#27)

@jakearchibald 

Requoting myself:

> the code that creates child1 gets to unilaterally decide... 

I'm not suggesting:

```js
child1 = parent.then(..);
child1.cancel();
```

I'm suggesting:

```js
child1 = parent.then(..);
parent.cancel();
```

By having the reference `parent` to observe, I also have the same reference `parent` that lets me cancel it for everyone else.

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