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

net/android/network_change_notifier_factory_android.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 NET_ANDROID_NETWORK_CHANGE_NOTIFIER_FACTORY_ANDROID_H_
 #define NET_ANDROID_NETWORK_CHANGE_NOTIFIER_FACTORY_ANDROID_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "net/android/network_change_notifier_delegate_android.h"
 #include "net/base/net_export.h"
 #include "net/base/network_change_notifier_factory.h"
 
 namespace net {
 
 class NetworkChangeNotifier;
 class NetworkChangeNotifierDelegateAndroid;
 
 // NetworkChangeNotifierFactory creates Android-specific specialization of
 // NetworkChangeNotifier. See network_change_notifier_android.h for more
 // details.
 class NET_EXPORT NetworkChangeNotifierFactoryAndroid :
     public NetworkChangeNotifierFactory {
  public:
   // Must be called on the JNI thread.
   NetworkChangeNotifierFactoryAndroid();
 
   // Must be called on the JNI thread.
-  virtual ~NetworkChangeNotifierFactoryAndroid();
+  ~NetworkChangeNotifierFactoryAndroid() override;
 
   // NetworkChangeNotifierFactory:
-  virtual NetworkChangeNotifier* CreateInstance() override;
+  NetworkChangeNotifier* CreateInstance() override;
 
  private:
   // Delegate passed to the instances created by this class.
   NetworkChangeNotifierDelegateAndroid delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkChangeNotifierFactoryAndroid);
 };
 
 }  // namespace net
 
 #endif  // NET_ANDROID_NETWORK_CHANGE_NOTIFIER_FACTORY_H_