Update {virtual,override,final} to follow C++11 style in ui.

ui/chromeos/network/network_state_notifier.h

 // Copyright (c) 2012 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_CHROMEOS_NETWORK_NETWORK_STATE_NOTIFIER_H_
 #define UI_CHROMEOS_NETWORK_NETWORK_STATE_NOTIFIER_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 20 matching lines @@
 // 1. ShowNetworkConnectError() gets called after any user initiated connect
 //    failure. This will handle displaying an error notification.
 //    TODO(stevenjb): convert this class to use the new MessageCenter
 //    notification system.
 // 2. It observes NetworkState changes to generate notifications when a
 //    Cellular network is out of credits.
 class UI_CHROMEOS_EXPORT NetworkStateNotifier :
       public chromeos::NetworkStateHandlerObserver {
  public:
   explicit NetworkStateNotifier(NetworkConnect* network_connect);
-  virtual ~NetworkStateNotifier();
+  ~NetworkStateNotifier() override;
 
   // NetworkStateHandlerObserver
-  virtual void DefaultNetworkChanged(
-      const chromeos::NetworkState* network) override;
-  virtual void NetworkPropertiesUpdated(
-      const chromeos::NetworkState* network) override;
+  void DefaultNetworkChanged(const chromeos::NetworkState* network) override;
+  void NetworkPropertiesUpdated(const chromeos::NetworkState* network) override;
 
   // Show a connection error notification. If |error_name| matches an error
   // defined in NetworkConnectionHandler for connect, configure, or activation
   // failed, then the associated message is shown; otherwise use the last_error
   // value for the network or a Shill property if available.
   void ShowNetworkConnectError(const std::string& error_name,
                                const std::string& service_path);
 
   // Show a mobile activation error notification.
   void ShowMobileActivationError(const std::string& service_path);
@@ skipping 38 matching lines @@
   base::Time out_of_credits_notify_time_;
   std::set<std::string> cellular_activating_;
   base::WeakPtrFactory<NetworkStateNotifier> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkStateNotifier);
 };
 
 }  // namespace ui
 
 #endif  // UI_CHROMEOS_NETWORK_NETWORK_STATE_NOTIFIER_H_