Re: [w3c/ServiceWorker] Making a concurrent request for navigations (#920)

@domenic in short, during _navigate_ `fetch` event there already could be an inflight request, or could not. So it either exists or not, and at a time of the `fetch` event response may not be available yet, hence a promise.

But honestly I thought that it's going to be:

```js
if (event.navigationPreload) {
  event.navigationPreload.then(() => ...);
}
```

Not nullable promise. With nullable promise it would require checking that promise all the time.

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