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

chrome/common/security_filter_peer.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_COMMON_SECURITY_FILTER_PEER_H__
 #define CHROME_COMMON_SECURITY_FILTER_PEER_H__
 #pragma once
 
 #include "webkit/glue/resource_loader_bridge.h"
@@ skipping 92 matching lines @@
   ReplaceContentPeer(webkit_glue::ResourceLoaderBridge* resource_loader_bridge,
                      webkit_glue::ResourceLoaderBridge::Peer* peer,
                      const std::string& mime_type,
                      const std::string& data);
   virtual ~ReplaceContentPeer();
 
   // ResourceLoaderBridge::Peer Implementation.
   virtual void OnReceivedResponse(
       const webkit_glue::ResourceResponseInfo& info,
       bool content_filtered);
-  void OnReceivedData(const char* data, int len);
-  void OnCompletedRequest(const URLRequestStatus& status,
-                          const std::string& security_info,
-                          const base::Time& completion_time);
+  virtual void OnReceivedData(const char* data, int len);
+  virtual void OnCompletedRequest(const URLRequestStatus& status,
+                                  const std::string& security_info,
+                                  const base::Time& completion_time);
 
  private:
   webkit_glue::ResourceResponseInfo response_info_;
   std::string mime_type_;
   std::string data_;
 
   DISALLOW_COPY_AND_ASSIGN(ReplaceContentPeer);
 };
 
 #endif  // CHROME_COMMON_SECURITY_FILTER_PEER_H__