Standardize usage of virtual/override/final specifiers.

ui/events/x/device_data_manager_x11.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_EVENTS_X_DEVICE_DATA_MANAGER_X11_H_
 #define UI_EVENTS_X_DEVICE_DATA_MANAGER_X11_H_
 
 // Generically-named #defines from Xlib is conflicting with symbols in GTest.
 // So many tests .cc file #undef Bool before including device_data_manager.h,
 // which makes Bool unrecognized in XInput2.h.
@@ skipping 223 matching lines @@
 
   // Disables and enables events from devices by device id.
   void DisableDevice(unsigned int deviceid);
   void EnableDevice(unsigned int deviceid);
 
   // Returns true if |native_event| should be blocked.
   bool IsEventBlocked(const base::NativeEvent& native_event);
 
  protected:
   // DeviceHotplugEventObserver:
-  virtual void OnKeyboardDevicesUpdated(
+  void OnKeyboardDevicesUpdated(
       const std::vector<KeyboardDevice>& devices) override;
 
  private:
   DeviceDataManagerX11();
-  virtual ~DeviceDataManagerX11();
+  ~DeviceDataManagerX11() override;
 
   // Initialize the XInput related system information.
   bool InitializeXInputInternal();
 
   // Check if an XI event contains data of the specified type.
   bool HasEventData(const XIDeviceEvent* xiev, const DataType type) const;
 
   void InitializeValuatorsForTest(int deviceid,
                                   int start_valuator,
                                   int end_valuator,
@@ skipping 55 matching lines @@
 
   unsigned char button_map_[256];
   int button_map_count_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceDataManagerX11);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_X_DEVICE_DATA_MANAGER_X11_H_