Re: [ServiceWorker] Changing Request and fetch() (#625)

@wanderview the right API fit feels like extendable promises

```js
var fetchPromise = fetch('/');

// as usual
fetchPromise.then(…);

// but also
fetchPromise.abort();
```

But I understand extendable promises haven't been worked out.

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https://github.com/slightlyoff/ServiceWorker/issues/625#issuecomment-74509734