Revert of Migrate WebVR Cardboard implementation to GVR

device/vr/android/cardboard/cardboard_vr_device_provider.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/android/cardboard/cardboard_vr_device_provider.h"
+
+#include "device/vr/android/cardboard/cardboard_vr_device.h"
+
+namespace device {
+
+CardboardVRDeviceProvider::CardboardVRDeviceProvider() : VRDeviceProvider() {}
+
+CardboardVRDeviceProvider::~CardboardVRDeviceProvider() {}
+
+void CardboardVRDeviceProvider::GetDevices(std::vector<VRDevice*>* devices) {
+  if (!cardboard_device_) {
+    cardboard_device_.reset(new CardboardVRDevice(this));
+  }
+
+  devices->push_back(cardboard_device_.get());
+}
+
+void CardboardVRDeviceProvider::Initialize() {
+  // No initialization needed for Cardboard devices.
+}
+
+}  // namespace device