Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/background/background_application_list_model.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 CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_
 #define CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_
 
 #include <map>
 #include <string>
 
@@ skipping 31 matching lines @@
     // it no longer detects a previously known extension.
     virtual void OnApplicationListChanged(Profile* profile);
 
    protected:
     virtual ~Observer();
   };
 
   // Create a new model associated with profile.
   explicit BackgroundApplicationListModel(Profile* profile);
 
-  virtual ~BackgroundApplicationListModel();
+  ~BackgroundApplicationListModel() override;
 
   // Associate observer with this model.
   void AddObserver(Observer* observer);
 
   // Return the icon associated with |extension| or NULL.  NULL indicates either
   // that there is no icon associated with the extension, or that a pending
   // task to retrieve the icon has not completed.  See the Observer class above.
   //
   // NOTE: The model manages the ImageSkia result, that is it "owns" the memory,
   //       releasing it if the associated background application is unloaded.
@@ skipping 46 matching lines @@
   void DissociateApplicationData(const extensions::Extension* extension);
 
   // Returns the Application associated with |extension| or NULL.
   const Application* FindApplication(
       const extensions::Extension* extension) const;
 
   // Returns the Application associated with |extension| or NULL.
   Application* FindApplication(const extensions::Extension* extension);
 
   // content::NotificationObserver implementation.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) override;
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
 
   // Notifies observers that some of the data associated with this background
   // application, e. g. the Icon, has changed.
   void SendApplicationDataChangedNotifications(
       const extensions::Extension* extension);
 
   // Notifies observers that at least one background application has been added
   // or removed.
   void SendApplicationListChangedNotifications();
 
@@ skipping 23 matching lines @@
   extensions::ExtensionList extensions_;
   ObserverList<Observer, true> observers_;
   Profile* profile_;
   content::NotificationRegistrar registrar_;
   bool ready_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundApplicationListModel);
 };
 
 #endif  // CHROME_BROWSER_BACKGROUND_BACKGROUND_APPLICATION_LIST_MODEL_H_