Re: [fetch] Navigate likely needs to be "no-cors" after all, need to update security checks (#126)

>From IRC:

```
11:52 AM <JakeA> wanderview: because I might respond with caches.match('/static/page-shell-7bfab2c.html')
11:53 AM <JakeA> This is what https://wiki-offline.jakearchibald.com/ does
11:54 AM <JakeA> https://github.com/jakearchibald/offline-wikipedia/blob/master/public/js/sw/index.js#L82
```

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