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

@dominickng, @mgiuca, @mounirlamouri , I'm still a little bit confused by this part of the spec: 

```js
      if (this.defaultPrevented === false) {
        const msg = ".prompt() needs to be called after .preventDefault()";
        throw new DOMException(msg, "InvalidStateError");
      }
```

Because, you can immediately do:

```js
ev.preventDefault();
ev.prompt().then(...);
```

Why don't we just treat such .prompt() calls as normal? So:

```js
addEventListener("beforeinstallprompt", async function(ev) {
   const { userChoice } = await ev.prompt();
   console.log("user chose:", userChoice); 
} );
```

I'm probably missing something... but that would be nicer than throwing so many errors.  


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