Clean up WebVR RequestPresent and make callback asynchronous.

device/vr/test/fake_vr_device.cc

Index: device/vr/test/fake_vr_device.cc
diff --git a/device/vr/test/fake_vr_device.cc b/device/vr/test/fake_vr_device.cc
index ca0f8f8a19c44610fd71562f244fc198c00c3879..b50f66d889742642c8f6ab7050ded9be27861e14 100644
--- a/device/vr/test/fake_vr_device.cc
+++ b/device/vr/test/fake_vr_device.cc
@@ -70,10 +70,12 @@ mojom::VRPosePtr FakeVRDevice::GetPose() {
 void FakeVRDevice::ResetPose() {}
 
 // TODO(shaobo.yan@intel.com): Will implemenate for VRDeviceServiceImpl tests.
-bool FakeVRDevice::RequestPresent(bool secure_origin) {
-  return true;
+void FakeVRDevice::RequestPresent(const base::Callback<void(bool)>& callback) {
+  callback.Run(true);
 }
 
+void FakeVRDevice::SetSecureOrigin(bool secure_origin) {}
+
 void FakeVRDevice::ExitPresent() {}
 
 void FakeVRDevice::SubmitFrame(mojom::VRPosePtr pose) {}