Add OVERRIDE to net/.

net/tools/fetch/http_session.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 NET_BASE_TOOLS_HTTP_SESSION_H_
 #define NET_BASE_TOOLS_HTTP_SESSION_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "net/http/http_request_info.h"
 #include "net/tools/fetch/http_listen_socket.h"
 
 // An HttpSession encapsulates a server-side HTTP listen socket.
 class HttpSession : HttpListenSocket::Delegate {
  public:
   HttpSession(const std::string& ip, int port);
   virtual ~HttpSession();
 
   virtual void OnRequest(HttpListenSocket* connection,
-                         HttpServerRequestInfo* info);
+                         HttpServerRequestInfo* info) OVERRIDE;
 
  private:
   scoped_refptr<HttpListenSocket> socket_;
   DISALLOW_COPY_AND_ASSIGN(HttpSession);
 };
 
 #endif // NET_BASE_TOOLS_HTTP_SESSION_H_