toggle between 2d and Google Cardboard

Hi
With the new Google Cardboard for Unity release I am updating my project.
This is my current code

Code (CSharp):

1. public class VRToggle : MonoBehaviour
2. {
3.  
4.     public void Start()
5.  
6.     {
7.         StartCoroutine(SwitchToVR());
8.         //  StartCoroutine(ActivatorVR("Cardboard"));
9.  
10.     }
11.  
12.     IEnumerator SwitchToVR()
13.     {
14.         // Device names are lowercase, as returned by `XRSettings.supportedDevices`.
15.         string desiredDevice = "cardboard"; // Or "cardboard".
16.  
17.         if (System.String.Compare(XRSettings.loadedDeviceName, desiredDevice, true) != 0)
18.         {
19.             XRSettings.LoadDeviceByName(desiredDevice);
20.  
21.             // Must wait one frame after calling `XRSettings.LoadDeviceByName()`.
22.             yield return null;
23.         }
24.  
25.         // Now it's ok to enable VR mode.
26.         XRSettings.enabled = true;
27.  
28.     }
29. }
30.  

How do i update this for the new plugin based system?
thanks