Ports VRService to be hosted in the device service.

content/public/app/mojo/content_browser_manifest.json

 {
   "name": "content_browser",
   "display_name": "Content (browser process)",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         "gpu": [
           "content::mojom::FieldTrialRecorder",
           "media::mojom::AndroidOverlayProvider",
           "memory_instrumentation::mojom::Coordinator"
@@ skipping 71 matching lines @@
           "autofill::mojom::AutofillDriver",
           "autofill::mojom::PasswordManagerDriver",
           "blink::mojom::MediaSessionService",
           "blink::mojom::PermissionService",
           "blink::mojom::PresentationService",
           "blink::mojom::SensitiveInputVisibilityService",
           "blink::mojom::WebBluetoothService",
           "blink::mojom::WebSocket",
           // TODO(beng): figure out how to overlay test interfaces like this.
           "content::mojom::BrowserTarget",
-          "device::mojom::VRService",
           "device::mojom::GeolocationService",
           "device::mojom::WakeLockService",
           "device::nfc::mojom::NFC",
           "device::usb::DeviceManager",
           "discardable_memory::mojom::DiscardableSharedMemoryManager",
           "media::mojom::InterfaceFactory",
           "media::mojom::RemoterFactory",
           "media::mojom::Renderer",
           "mojom::MediaDevicesDispatcherHost",
           "payments::mojom::PaymentRequest",
           "ui::mojom::Gpu"
         ]
       },
       "requires": {
         "content_renderer": [ "browser" ]
       }
     }
   }
 }