Re: [w3c/ServiceWorker] cors image request retry not work (#1488)

A sample code:

```
self.addEventListener('fetch', function(e) {
  if(e.request.url === 'https://cdna.com/img.png'){
    return fetch(new Request('https://cdnb.com/img.png'));
  }else{
    return fetch(e.request);
  }
});
```

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