Move touchscreen device caching to DeviceDataManager

ui/ozone/common/chromeos/touchscreen_device_manager_ozone.h

-// Copyright 2014 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 UI_OZONE_COMMON_TOUCHSCREEN_DEVICE_MANAGER_OZONE_H_
-#define UI_OZONE_COMMON_TOUCHSCREEN_DEVICE_MANAGER_OZONE_H_
-
-#include "base/macros.h"
-#include "ui/display/types/chromeos/touchscreen_device_manager.h"
-
-namespace ui {
-
-class TouchscreenDeviceManagerOzone : public TouchscreenDeviceManager {
- public:
-  TouchscreenDeviceManagerOzone();
-  virtual ~TouchscreenDeviceManagerOzone();
-
-  // TouchscreenDeviceManager:
-  virtual std::vector<TouchscreenDevice> GetDevices() OVERRIDE;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(TouchscreenDeviceManagerOzone);
-};
-
-}  // namespace ui
-
-#endif  // UI_OZONE_COMMON_TOUCHSCREEN_DEVICE_MANAGER_OZONE_H_