Re: [whatwg/fetch] Body should not be transmitted if service worker intercepts request (#572)

Do we care about sites observing there is a service worker?  We break that in other places.

For example, this code:

```
let response = await fetch(crossOriginURL, { mode: 'no-cors' });
let text = await response.text();
```

Without a service worker the response will always be opaque and the text will be empty string.  A service worker can return a basic Response, though, and the spec currently says to expose that basic response to the outer page.  So in that case the body could be observed.   (There was a spec issue about this case, but I don't have it handy at the moment.)



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