Re: [ServiceWorker] spec should be more explicit about accessing internal body on opaque Responses (#710)

@annevk, so you think these should have different behavior?

Where a fetch event is generated from an <img> element:

```
  evt.respondWith(fetch('http://otherorigin.com/cats.jpg', { mode: 'no-cors', method: 'HEAD' }));
```

Vs:

```
  // cache populated with a GET providing the body
  evt.respondWith(cache.match(new Request('http://otherorigin.com/cats.jpg',
                                                  { mode: 'no-cors', method: 'HEAD' })));
```

You are saying that code snippet 1 should NOT show the image in the <img> element, but snippet 2 should show the image?

Per the current spec language both of these snippets result in the same behavior.  The image is not shown because the Response was created via a HEAD Request.

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