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

The following also works with fetch:

```js
async function getResource(onCancel) {
  var controller = new FetchController(), 
  signal = controller.signal;
  onCancel(() => controller.abort());
  var result = await fetch("./someResource", {signal}).then(req => req.text());
  return process(result);
}

// outside
var cancel;
var resourcePromise = getResource(fn => cancel = fn);
onExternalEventThatCausesCancellation(() => {
  cancel(); // calls .abort on the fetch controller.
});

// Or:
var resource = await getResource(onExternalEventThatCausesCancellation);

```

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