Standardize usage of virtual/override/final in content/renderer/

content/renderer/image_loading_helper.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 CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_
 #define CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_vector.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "url/gurl.h"
 
 class SkBitmap;
 
 namespace content {
 
 class MultiResolutionImageResourceFetcher;
 
 // This class deals with image downloading.
 // One instance of ImageLoadingHelper is owned by RenderFrame.
 class ImageLoadingHelper : public RenderFrameObserver {
  public:
   explicit ImageLoadingHelper(RenderFrame* render_frame);
 
  private:
-  virtual ~ImageLoadingHelper();
+  ~ImageLoadingHelper() override;
 
   // Message handler.
   void OnDownloadImage(int id,
                        const GURL& image_url,
                        bool is_favicon,
                        uint32_t max_image_size);
 
   // Requests to download an image. When done, the ImageLoadingHelper
   // is notified by way of DidDownloadImage. Returns true if the
   // request was successfully started, false otherwise. id is used to
@@ skipping 14 matching lines @@
   // details.
   void DidDownloadImage(
       uint32_t max_image_size,
       MultiResolutionImageResourceFetcher* fetcher,
       const std::vector<SkBitmap>& images);
 
   // Decodes a data: URL image or returns an empty image in case of failure.
   SkBitmap ImageFromDataUrl(const GURL&) const;
 
   // RenderFrameObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
   typedef ScopedVector<MultiResolutionImageResourceFetcher>
       ImageResourceFetcherList;
 
   // ImageResourceFetchers schedule via DownloadImage.
   ImageResourceFetcherList image_fetchers_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageLoadingHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_IMAGE_LOADING_HELPER_H_