mojo VR interface simplified

device/vr/android/gvr/gvr_device_provider.cc

Index: device/vr/android/gvr/gvr_device_provider.cc
diff --git a/device/vr/android/gvr/gvr_device_provider.cc b/device/vr/android/gvr/gvr_device_provider.cc
index 1025ca40726bfe2136cc3ee93f18d62cc8b0d8fc..37c00fd745fea871ec88a49721b8d6c4fabadf37 100644
--- a/device/vr/android/gvr/gvr_device_provider.cc
+++ b/device/vr/android/gvr/gvr_device_provider.cc
@@ -90,15 +90,13 @@ void GvrDeviceProvider::GetDevices(std::vector<VRDevice*>* devices) {
     devices->push_back(vr_device_.get());
 }
 
-void GvrDeviceProvider::SetClient(VRClientDispatcher* client) {
-  if (!client_)
-    client_.reset(client);
-}
-
 void GvrDeviceProvider::Initialize() {
   if (!vr_device_) {
     vr_device_.reset(new GvrDevice(this, nullptr));
-    client_->OnDeviceConnectionStatusChanged(vr_device_.get(), true);
+
+    // TODO(Shaobo) : call event here in this way is not proper,
+    // need to find another way.
+    // vr_device_->OnDisplayConnected();
   }
 }
 
@@ -124,9 +122,6 @@ void GvrDeviceProvider::ExitPresent() {
   GvrDelegateProvider* delegate_provider = GvrDelegateProvider::GetInstance();
   if (delegate_provider)
     delegate_provider->ExitWebVRPresent();
-
-  if (client_)
-    client_->OnPresentEnded(vr_device_.get());
 }
 
 void GvrDeviceProvider::OnGvrDelegateReady(GvrDelegate* delegate) {