Re: [w3c/webpayments-payment-apps-api] Example 3 does not work (#82)

This example shouldn't be in the spec, specially the part that does:

```JS
const url = 'data:text/html;base64,' + btoa(body);
```
(that defeats the whole point of service workers: if you want to open the window at a URL, then open the URL and have the service worker serve the response form the cache)

There are also a bunch of other issues, like: 

```JS
throw new Error('No content type header.'); 
```

Will result in a corrupt content error being shown to the end-user. Same with the exception thrown at the end. Those should be 500 Error responses. 


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