Re: [whatwg/fetch] Aborting a fetch: The Next Generation (#447)

@stuartpb I forgot to reply to your earlier question. Yes, my intention was to allow a controller to follow multiple signals.

Code for your example, in case anyone finds it easier to follow (like me):

```js
const controllerA = new FetchController();
const controllerB = new FetchController();
const controllerC = new FetchController();

controllerC.follow(controllerB.signal);
controllerB.follow(controllerA.signal);

controllerB.setPriority(2);
controllerC.setPriority(3);
controllerA.setPriority(2);

// controllerA priority: 2
// controllerB priority: 2
// controllerC priority: 3
```

Yeah, I can see what you're saying. I'm not sure how much of an issue it is in practice though. Hmm.

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