Standardize usage of virtual/override/final in extensions/

extensions/browser/warning_service.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 EXTENSIONS_BROWSER_WARNING_SERVICE_H_
 #define EXTENSIONS_BROWSER_WARNING_SERVICE_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 24 matching lines @@
                        public base::NonThreadSafe {
  public:
   class Observer {
    public:
     virtual void ExtensionWarningsChanged() = 0;
   };
 
   // |browser_context| may be NULL for testing. In this case, be sure to not
   // insert any warnings.
   explicit WarningService(content::BrowserContext* browser_context);
-  virtual ~WarningService();
+  ~WarningService() override;
 
   // Clears all warnings of types contained in |types| and notifies observers
   // of the changed warnings.
   void ClearWarnings(const std::set<Warning::WarningType>& types);
 
   // Returns all types of warnings effecting extension |extension_id|.
   std::set<Warning::WarningType> GetWarningTypesAffectingExtension(
       const std::string& extension_id) const;
 
   // Returns all localized warnings for extension |extension_id| in |result|.
   std::vector<std::string> GetWarningMessagesForExtension(
       const std::string& extension_id) const;
 
   const WarningSet& warnings() const { return warnings_; }
 
   // Adds a set of warnings and notifies observers if any warning is new.
   void AddWarnings(const WarningSet& warnings);
 
   // Notifies the WarningService of browser_context |browser_context_id| that
   // new |warnings| occurred and triggers a warning badge.
   static void NotifyWarningsOnUI(void* profile_id, const WarningSet& warnings);
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
  private:
   void NotifyWarningsChanged();
 
   // ExtensionRegistryObserver implementation.
-  virtual void OnExtensionUnloaded(content::BrowserContext* browser_context,
-                                   const Extension* extension,
-                                   UnloadedExtensionInfo::Reason reason)
-      override;
+  void OnExtensionUnloaded(content::BrowserContext* browser_context,
+                           const Extension* extension,
+                           UnloadedExtensionInfo::Reason reason) override;
 
   // Currently existing warnings.
   WarningSet warnings_;
 
   content::BrowserContext* const browser_context_;
 
   // Listen to extension unloaded notifications.
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 
   ObserverList<Observer> observer_list_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_WARNING_SERVICE_H_