Re: [w3c/permissions] chore(examples): Modernize JS examples (#101)

> -                                             deviceId: devices[0].deviceId})
> -      })
> -      .then(function(result) {
> -         console.log('Camera permission to first camera is ' + result.state);
> -      }
> -      .catch(err => console.log('Bad things happened: ' + err.name));
> -    </script>
> +navigator.mediaDevices
> +  .enumerateDevices()
> +  // filter out just video inputs
> +  .then(
> +    devices => devices.filter(({ kind }) => kind === "videoinput")
> +  )
> +  // get the deviceId of first camera, create query object
> +  .then(
> +    ([{ deviceId }]) => ({ name: "camera", deviceId })

Yep, good suggestion. Can do basically, filter, and then map to query object, and then map to promise there... and promise.all() for the cameras. 

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