Standardize usage of virtual/override/final in ui/

ui/message_center/notification_delegate.h

Index: ui/message_center/notification_delegate.h
diff --git a/ui/message_center/notification_delegate.h b/ui/message_center/notification_delegate.h
index 2faf2d0a82d5d1b6abcf7cc095a9d2dd62545a6c..f870fcb4d18f1f14b671ae3c066cadd7259f2f13 100644
--- a/ui/message_center/notification_delegate.h
+++ b/ui/message_center/notification_delegate.h
@@ -59,15 +59,15 @@ class MESSAGE_CENTER_EXPORT HandleNotificationClickedDelegate
   explicit HandleNotificationClickedDelegate(const base::Closure& closure);
 
   // message_center::NotificationDelegate overrides:
-  virtual void Display() override;
-  virtual void Error() override;
-  virtual void Close(bool by_user) override;
-  virtual bool HasClickedListener() override;
-  virtual void Click() override;
-  virtual void ButtonClick(int button_index) override;
+  void Display() override;
+  void Error() override;
+  void Close(bool by_user) override;
+  bool HasClickedListener() override;
+  void Click() override;
+  void ButtonClick(int button_index) override;
 
  protected:
-  virtual ~HandleNotificationClickedDelegate();
+  ~HandleNotificationClickedDelegate() override;
 
  private:
   std::string id_;
@@ -87,14 +87,14 @@ class MESSAGE_CENTER_EXPORT HandleNotificationButtonClickDelegate
       const ButtonClickCallback& button_callback);
 
   // message_center::NotificationDelegate overrides:
-  virtual void Display() override;
-  virtual void Error() override;
-  virtual void Close(bool by_user) override;
-  virtual void Click() override;
-  virtual void ButtonClick(int button_index) override;
+  void Display() override;
+  void Error() override;
+  void Close(bool by_user) override;
+  void Click() override;
+  void ButtonClick(int button_index) override;
 
  protected:
-  virtual ~HandleNotificationButtonClickDelegate();
+  ~HandleNotificationButtonClickDelegate() override;
 
  private:
   ButtonClickCallback button_callback_;