Add the "virtual" keyword on method overrides that are missing it.

chrome/browser/renderer_host/download_resource_handler.h

 // Copyright (c) 2010 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_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 16 matching lines @@
   DownloadResourceHandler(ResourceDispatcherHost* rdh,
                           int render_process_host_id,
                           int render_view_id,
                           int request_id,
                           const GURL& url,
                           DownloadFileManager* download_file_manager,
                           net::URLRequest* request,
                           bool save_as,
                           const DownloadSaveInfo& save_info);
 
-  bool OnUploadProgress(int request_id, uint64 position, uint64 size);
+  virtual bool OnUploadProgress(int request_id, uint64 position, uint64 size);
 
   // Not needed, as this event handler ought to be the final resource.
-  bool OnRequestRedirected(int request_id, const GURL& url,
-                           ResourceResponse* response, bool* defer);
+  virtual bool OnRequestRedirected(int request_id, const GURL& url,
+                                   ResourceResponse* response, bool* defer);
 
   // Send the download creation information to the download thread.
-  bool OnResponseStarted(int request_id, ResourceResponse* response);
+  virtual bool OnResponseStarted(int request_id, ResourceResponse* response);
 
   // Pass-through implementation.
-  bool OnWillStart(int request_id, const GURL& url, bool* defer);
+  virtual bool OnWillStart(int request_id, const GURL& url, bool* defer);
 
   // Create a new buffer, which will be handed to the download thread for file
   // writing and deletion.
-  bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
-                  int min_size);
+  virtual bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
+                          int min_size);
 
-  bool OnReadCompleted(int request_id, int* bytes_read);
+  virtual bool OnReadCompleted(int request_id, int* bytes_read);
 
-  bool OnResponseCompleted(int request_id,
-                           const URLRequestStatus& status,
-                           const std::string& security_info);
-  void OnRequestClosed();
+  virtual bool OnResponseCompleted(int request_id,
+                                   const URLRequestStatus& status,
+                                   const std::string& security_info);
+  virtual void OnRequestClosed();
 
   // If the content-length header is not present (or contains something other
   // than numbers), the incoming content_length is -1 (unknown size).
   // Set the content length to 0 to indicate unknown size to DownloadManager.
   void set_content_length(const int64& content_length);
 
   void set_content_disposition(const std::string& content_disposition);
 
   void CheckWriteProgress();
 
@@ skipping 21 matching lines @@
   base::OneShotTimer<DownloadResourceHandler> pause_timer_;
 
   static const int kReadBufSize = 32768;  // bytes
   static const size_t kLoadsToWrite = 100;  // number of data buffers queued
   static const int kThrottleTimeMs = 200;  // milliseconds
 
   DISALLOW_COPY_AND_ASSIGN(DownloadResourceHandler);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_DOWNLOAD_RESOURCE_HANDLER_H_