Standardize usage of virtual/override/final in ui/

ui/message_center/cocoa/settings_controller.h

Index: ui/message_center/cocoa/settings_controller.h
diff --git a/ui/message_center/cocoa/settings_controller.h b/ui/message_center/cocoa/settings_controller.h
index 83433b46a9914b875b97898aaba449dee4fad2f4..10a990267ca6b4020e3a3eb1d6ddaf42859b4fb8 100644
--- a/ui/message_center/cocoa/settings_controller.h
+++ b/ui/message_center/cocoa/settings_controller.h
@@ -27,11 +27,11 @@ class NotifierSettingsObserverMac : public NotifierSettingsObserver {
   virtual ~NotifierSettingsObserverMac();
 
   // Overridden from NotifierSettingsObserver:
-  virtual void UpdateIconImage(const NotifierId& notifier_id,
-                               const gfx::Image& icon) override;
-  virtual void NotifierGroupChanged() override;
-  virtual void NotifierEnabledChanged(const NotifierId& notifier_id,
-                                      bool enabled) override;
+  void UpdateIconImage(const NotifierId& notifier_id,
+                       const gfx::Image& icon) override;
+  void NotifierGroupChanged() override;
+  void NotifierEnabledChanged(const NotifierId& notifier_id,
+                              bool enabled) override;
 
  private:
   MCSettingsController* settings_controller_;  // weak, owns this