Re: [ServiceWorker] Returning a FetchPromise from fetch() (#625)

@tabatkins

I'm afraid if in your code

```js
var p = FetchPromise.resolve(waitForUserConfirm('press OK to continue')).then(() => fetch(url));
```

the `p.abort()` can really abort the `fetch` process, which is a basic requirement for us, how can a `FetchPromise.resolve` create a `FetchPromise` which is aware of the `fetch` call?

We don't need a `no-op` abort method, we need one which actually aborts the fetch

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