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

chrome/browser/renderer_host/sync_resource_handler.h

 // Copyright (c) 2006-2008 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_SYNC_RESOURCE_HANDLER_H_
 #define CHROME_BROWSER_RENDERER_HOST_SYNC_RESOURCE_HANDLER_H_
 #pragma once
 
 #include <string>
 
 #include "chrome/browser/renderer_host/resource_dispatcher_host.h"
 #include "chrome/browser/renderer_host/resource_handler.h"
 #include "chrome/common/resource_response.h"
 
 namespace net {
 class IOBuffer;
 }
 
 // Used to complete a synchronous resource request in response to resource load
 // events from the resource dispatcher host.
 class SyncResourceHandler : public ResourceHandler {
  public:
   SyncResourceHandler(ResourceDispatcherHost::Receiver* receiver,
                       int process_id,
                       const GURL& url,
                       IPC::Message* result_message,
                       ResourceDispatcherHost* resource_dispatcher_host);
 
-  bool OnUploadProgress(int request_id, uint64 position, uint64 size);
-  bool OnRequestRedirected(int request_id, const GURL& new_url,
-                           ResourceResponse* response, bool* defer);
-  bool OnResponseStarted(int request_id, ResourceResponse* response);
-  bool OnWillStart(int request_id, const GURL& url, bool* defer);
-  bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
-                  int min_size);
-  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 OnUploadProgress(int request_id, uint64 position, uint64 size);
+  virtual bool OnRequestRedirected(int request_id, const GURL& new_url,
+                                   ResourceResponse* response, bool* defer);
+  virtual bool OnResponseStarted(int request_id, ResourceResponse* response);
+  virtual bool OnWillStart(int request_id, const GURL& url, bool* defer);
+  virtual bool OnWillRead(int request_id, net::IOBuffer** buf, int* buf_size,
+                          int min_size);
+  virtual bool OnReadCompleted(int request_id, int* bytes_read);
+  virtual bool OnResponseCompleted(int request_id,
+                                   const URLRequestStatus& status,
+                                   const std::string& security_info);
+  virtual void OnRequestClosed();
 
  private:
   enum { kReadBufSize = 3840 };
 
   ~SyncResourceHandler();
 
   scoped_refptr<net::IOBuffer> read_buffer_;
 
   SyncLoadResult result_;
   ResourceDispatcherHost::Receiver* receiver_;
   int process_id_;
   IPC::Message* result_message_;
   ResourceDispatcherHost* rdh_;
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_SYNC_RESOURCE_HANDLER_H_