Fix WebVR crash caused by InterfaceProviderSpec refactoring.

content/public/app/mojo/content_browser_manifest.json

 {
   "name": "service:content_browser",
   "display_name": "Content (browser process)",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         "gpu": [
           "device::mojom::PowerMonitor"
         ],
         "plugin": [
@@ skipping 57 matching lines @@
           "blink::mojom::MediaSessionService",
           "blink::mojom::PaymentRequest",
           "blink::mojom::PermissionService",
           "blink::mojom::PresentationService",
           "blink::mojom::SensitiveInputVisibilityService",
           "blink::mojom::ShapeDetection",
           "blink::mojom::WebBluetoothService",
           "blink::mojom::WebSocket",
           // TODO(beng): figure out how to overlay test interfaces like this.
           "content::mojom::BrowserTarget",
+          "device::VRService",
           "device::VibrationManager",
           "device::mojom::GeolocationService",
           "device::mojom::SensorProvider",
           "device::mojom::WakeLockService",
           "device::nfc::mojom::NFC",
           "device::usb::DeviceManager",
           "media::mojom::InterfaceFactory",
           "media::mojom::RemoterFactory",
           "mojom::MediaDevicesDispatcherHost"
         ]
       },
       "requires": {
         "service:content_renderer": [ "browser" ]
       }
     }
   }
 }