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

net/android/network_change_notifier_factory_android.h

Index: net/android/network_change_notifier_factory_android.h
diff --git a/net/android/network_change_notifier_factory_android.h b/net/android/network_change_notifier_factory_android.h
index d443fcdf4a2c0f88af89ff2d7037b475cbd32a37..035a84e8109921f9a33005aca68f6f2c0fe5a2cd 100644
--- a/net/android/network_change_notifier_factory_android.h
+++ b/net/android/network_change_notifier_factory_android.h
@@ -26,10 +26,10 @@ class NET_EXPORT NetworkChangeNotifierFactoryAndroid :
   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.