[whatwg/dom] Encourage use of AbortError for cancellation? (#927)

Bit of a half baked idea, but should we make it easier to throw abort errors from signals? Something like:

```js
AbortSignal.prototype.assertNotAborted = function(message = 'Aborted') {
  if (this.aborted) throw new DOMException(message, 'AbortError');
}
```

I know it's a one-liner, but it might encourage using the right kind of error?

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