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

chrome/browser/image_holder.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 CHROME_BROWSER_IMAGE_HOLDER_H_
 #define CHROME_BROWSER_IMAGE_HOLDER_H_
 
 #include "base/memory/scoped_vector.h"
 #include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
 #include "ui/gfx/image/image.h"
@@ skipping 12 matching lines @@
 };
 
 // This class encapsulates the action of fetching a bitmap, reporting when it is
 // fetched, and holding onto the bitmap until no longer needed.
 class ImageHolder : public chrome::BitmapFetcherDelegate {
  public:
   ImageHolder(const GURL& low_dpi_url,
               const GURL& high_dpi_url,
               Profile* profile,
               ImageHolderDelegate* delegate);
-  virtual ~ImageHolder();
+  ~ImageHolder() override;
 
   // Begin fetching of the URLs we have.
   void StartFetch();
 
   // Check whether we have a response from the server for these resources,
   // even if the response is a failed fetch.
   bool IsFetchingDone() const;
 
   // Inherited from BitmapFetcherDelegate
-  virtual void OnFetchComplete(const GURL url, const SkBitmap* bitmap) override;
+  void OnFetchComplete(const GURL url, const SkBitmap* bitmap) override;
 
   // Accessors:
   GURL low_dpi_url() const { return low_dpi_url_; }
   GURL high_dpi_url() const { return high_dpi_url_; }
   gfx::Image low_dpi_image() { return gfx::Image(image_); }
 
  private:
   // Helper function to create a bitmap fetcher (but not start the fetch).
   void CreateBitmapFetcher(const GURL& url);
 
   GURL low_dpi_url_;
   GURL high_dpi_url_;
   bool low_dpi_fetched_;
   bool high_dpi_fetched_;
   gfx::ImageSkia image_;
   ImageHolderDelegate* delegate_;
   ScopedVector<chrome::BitmapFetcher> fetchers_;
   Profile* profile_;
 
   FRIEND_TEST_ALL_PREFIXES(ImageHolderTest, CreateBitmapFetcherTest);
   FRIEND_TEST_ALL_PREFIXES(ImageHolderTest, OnFetchCompleteTest);
   FRIEND_TEST_ALL_PREFIXES(ImageHolderTest, IsFetchingDoneTest);
 
   DISALLOW_COPY_AND_ASSIGN(ImageHolder);
 };
 
 }  // namespace chrome.
 
 #endif  // CHROME_BROWSER_IMAGE_HOLDER_H_