Re: [w3c/manifest] Add installation prompt control flow (#417)

@mgiuca, d'oh, I think then we had a miscommunication back in https://github.com/w3c/manifest/issues/417#issuecomment-254726542

I thought we had agreed that .prompt() can only be called once. If prompt() can be called more than once, then I agree that the userChoice promise cannot be resolved. 

So, should we agree that this is ok:

```JS
window.addEventListener('beforeinstallprompt', () => {
  try {
    e.prompt();  // Error: preventDefault not called
  } catch (e) {}
  e.preventDefault();
  e.prompt();  // This is fine.
});
```



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