Revert of Migrate WebVR Cardboard implementation to GVR

device/vr/android/gvr/gvr_device.h

-// Copyright 2016 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.
-
-#ifndef DEVICE_VR_ANDROID_GVR_DEVICE_H
-#define DEVICE_VR_ANDROID_GVR_DEVICE_H
-
-#include "base/macros.h"
-#include "device/vr/vr_device.h"
-
-namespace gvr {
-class GvrApi;
-}  // namespace gvr
-
-namespace device {
-
-class GvrDevice : public VRDevice {
- public:
-  GvrDevice(VRDeviceProvider* provider, gvr::GvrApi* gvr_api);
-  ~GvrDevice() override;
-
-  // VRDevice
-  VRDisplayPtr GetVRDevice() override;
-  VRPosePtr GetPose() override;
-  void ResetPose() override;
-
- private:
-  gvr::GvrApi* gvr_api_;
-
-  DISALLOW_COPY_AND_ASSIGN(GvrDevice);
-};
-
-}  // namespace device
-
-#endif  // DEVICE_VR_ANDROID_GVR_DEVICE_H