[w3c/ServiceWorker] OPTIONS request reported as GET (#1498)

Should HTTP `OPTIONS` requests be accessible and available within a SW's fetch event? 
 `OPTIONS` requests are currently reported as `GET` requests even though the browser sends an HTTP `OPTIONS` request.

**sw.js**
```js
self.addEventListener("fetch", function (event) {
  console.log(event.request.method, event.request.url);
});
```
**app.js**
```js
navigator.serviceWorker.register('./sw.js')
fetch('https://example.com', {
  headers: {
    'force-cors-preflight': 'foo'
  }
});

```

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