Re: [fetch] Consider allow Service Worker to pass-through the original referrer (#89)

That looks perfect, I just didn't notice #80 

To be clear, the way this usecase would be solved is something like:
```javascript
onfetch = function(e) {
  r = e.request;
  e.respondWith(fetch(new Request(r.url, {method: r.method, headers: r.headers, ..., referrer: r.referrer, referrerPolicy: r.referrerPolicy));
}
```

right? And maybe copying of r.body if it exists.


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