Fixed crash when exiting page using GVR controller w/ the gamepad API

device/vr/android/gvr/gvr_gamepad_data_fetcher.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_GAMEPAD_DATA_FETCHER_H_
 #define DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_FETCHER_H_
 
 #include <string>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 24 matching lines @@
   ~GvrGamepadDataFetcher() override;
 
   GamepadSource source() override;
 
   void GetGamepadData(bool devices_changed_hint) override;
   void PauseHint(bool paused) override;
   void OnAddedToProvider() override;
 
  private:
   std::unique_ptr<gvr::ControllerApi> controller_api_;
-  std::unique_ptr<gvr::UserPrefs> user_prefs_;
   gvr::ControllerState controller_state_;
+  gvr::ControllerHandedness handedness_;
   unsigned int display_id_;
 
   DISALLOW_COPY_AND_ASSIGN(GvrGamepadDataFetcher);
 };
 
 }  // namespace device
 #endif  // DEVICE_VR_ANDROID_GVR_GAMEPAD_DATA_FETCHER_H_