Standardize usage of virtual/override/final in content/

content/child/power_monitor_broadcast_source.h

 // Copyright (c) 2013 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 CONTENT_CHILD_POWER_MONITOR_BROADCAST_SOURCE_H_
 #define CONTENT_CHILD_POWER_MONITOR_BROADCAST_SOURCE_H_
 
 #include "base/power_monitor/power_monitor_source.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_channel.h"
 
 namespace IPC {
 class MessageFilter;
 }
 
 namespace content {
 
 class PowerMessageFilter;
 
 // Receives Power Monitor IPC messages sent from the browser process and relays
 // them to the PowerMonitor of the current process.
 class CONTENT_EXPORT PowerMonitorBroadcastSource :
     public base::PowerMonitorSource {
  public:
   explicit PowerMonitorBroadcastSource();
-  virtual ~PowerMonitorBroadcastSource();
+  ~PowerMonitorBroadcastSource() override;
 
   IPC::MessageFilter* GetMessageFilter();
 
  private:
   friend class PowerMessageFilter;
 
-  virtual bool IsOnBatteryPowerImpl() override;
+  bool IsOnBatteryPowerImpl() override;
 
   void OnPowerStateChange(bool on_battery_power);
   void OnSuspend();
   void OnResume();
 
   bool last_reported_battery_power_state_;
   scoped_refptr<PowerMessageFilter> message_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerMonitorBroadcastSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_POWER_MONITOR_MESSAGE_FILTER_H_