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

chrome/browser/extensions/app_icon_loader_impl.h

 // Copyright (c) 2013 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_EXTENSIONS_APP_ICON_LOADER_IMPL_H_
 #define CHROME_BROWSER_EXTENSIONS_APP_ICON_LOADER_IMPL_H_
 
 #include <map>
 #include <string>
 
 #include "chrome/browser/extensions/app_icon_loader.h"
 #include "extensions/browser/extension_icon_image.h"
 
 class Profile;
 
 namespace extensions {
 class Extension;
 
 // Default implementation of ash::AppIconLoader that interacts with the
 // ExtensionService and ImageLoader to load images.
 class AppIconLoaderImpl : public AppIconLoader,
                           public extensions::IconImage::Observer {
  public:
   AppIconLoaderImpl(Profile* profile, int icon_size,
                     AppIconLoader::Delegate* delegate);
-  virtual ~AppIconLoaderImpl();
+  ~AppIconLoaderImpl() override;
 
   // AppIconLoader overrides:
-  virtual void FetchImage(const std::string& id) override;
-  virtual void ClearImage(const std::string& id) override;
-  virtual void UpdateImage(const std::string& id) override;
+  void FetchImage(const std::string& id) override;
+  void ClearImage(const std::string& id) override;
+  void UpdateImage(const std::string& id) override;
 
   // extensions::IconImage::Observer overrides:
-  virtual void OnExtensionIconImageChanged(
-      extensions::IconImage* image) override;
+  void OnExtensionIconImageChanged(extensions::IconImage* image) override;
 
  private:
   typedef std::map<extensions::IconImage*, std::string> ImageToExtensionIDMap;
 
   // Builds image for given |id| and |icon|.
   void BuildImage(const std::string& id, const gfx::ImageSkia& icon);
 
   Profile* profile_;
 
   // The delegate object which receives the icon images. No ownership.
   AppIconLoader::Delegate* delegate_;
 
   // Maps from IconImage pointer to the extension id.
   ImageToExtensionIDMap map_;
 
   const int icon_size_;
 
   DISALLOW_COPY_AND_ASSIGN(AppIconLoaderImpl);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_APP_ICON_LOADER_IMPL_H_