Standardize usage of virtual/override/final in extensions/

extensions/browser/extension_icon_image.h

 // Copyright 2014 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_EXTENSION_ICON_IMAGE_H_
 #define EXTENSIONS_BROWSER_EXTENSION_ICON_IMAGE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 51 matching lines @@
 
   // |context| is required by the underlying implementation to retrieve the
   // |ImageLoader| instance associated with the given context. |ImageLoader| is
   // used to perform the asynchronous image load work.
   IconImage(content::BrowserContext* context,
             const Extension* extension,
             const ExtensionIconSet& icon_set,
             int resource_size_in_dip,
             const gfx::ImageSkia& default_icon,
             Observer* observer);
-  virtual ~IconImage();
+  ~IconImage() override;
 
   const gfx::ImageSkia& image_skia() const { return image_skia_; }
 
  private:
   class Source;
 
   // Loads an image representation for the scale factor.
   // If the representation gets loaded synchronously, it is returned by this
   // method.
   // If representation loading is asynchronous, an empty image
   // representation is returned. When the representation gets loaded the
   // observer's |OnExtensionIconImageLoaded| will be called.
   gfx::ImageSkiaRep LoadImageForScaleFactor(ui::ScaleFactor scale_factor);
 
   void OnImageLoaded(float scale_factor, const gfx::Image& image);
 
   // content::NotificationObserver overrides:
-  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;
 
   content::BrowserContext* browser_context_;
   const Extension* extension_;
   const ExtensionIconSet& icon_set_;
   const int resource_size_in_dip_;
 
   Observer* observer_;
 
   Source* source_;  // Owned by ImageSkia storage.
   gfx::ImageSkia image_skia_;
   // The icon with whose representation |image_skia_| should be updated if
   // its own representation load fails.
   gfx::ImageSkia default_icon_;
 
   content::NotificationRegistrar registrar_;
 
   base::WeakPtrFactory<IconImage> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IconImage);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_ICON_IMAGE_H_