Refactor GvrDelegate ownership into GvrDelegateProvider and fix more threading violations.

device/vr/test/fake_vr_device.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/vr/test/fake_vr_device.h"
 
 namespace device {
 
 FakeVRDevice::FakeVRDevice() {
   device_ = mojom::VRDisplayInfo::New();
@@ skipping 36 matching lines @@
   eye->renderWidth = size;
   eye->renderHeight = size;
 
   return eye;
 }
 
 void FakeVRDevice::SetVRDevice(const mojom::VRDisplayInfoPtr& device) {
   device_ = device.Clone();
 }
 
-mojom::VRDisplayInfoPtr FakeVRDevice::GetVRDevice() {
+void FakeVRDevice::GetVRDevice(
+    const base::Callback<void(mojom::VRDisplayInfoPtr)>& callback) {
   mojom::VRDisplayInfoPtr display = device_.Clone();
-  return display.Clone();
+  callback.Run(std::move(display));
 }
 
 void FakeVRDevice::ResetPose() {}
 
 void FakeVRDevice::RequestPresent(const base::Callback<void(bool)>& callback) {
   callback.Run(true);
 }
 
 void FakeVRDevice::SetSecureOrigin(bool secure_origin) {}
 
 void FakeVRDevice::ExitPresent() {
   OnExitPresent();
 }
 
 void FakeVRDevice::SubmitFrame(mojom::VRPosePtr pose) {}
 
 void FakeVRDevice::UpdateLayerBounds(int16_t frame_index,
                                      mojom::VRLayerBoundsPtr leftBounds,
                                      mojom::VRLayerBoundsPtr rightBounds) {}
 
 void FakeVRDevice::GetVRVSyncProvider(mojom::VRVSyncProviderRequest request) {}
 
 }  // namespace device