Resubmit http://codereview.chromium.org/243096 with gcc compile error

chrome/browser/extensions/extension_host.h

 // Copyright (c) 2006-2009 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_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 
 #include <string>
 
 #include "base/scoped_ptr.h"
@@ skipping 94 matching lines @@
   virtual void ProcessDOMUIMessage(const std::string& message,
                                    const std::string& content,
                                    int request_id,
                                    bool has_callback);
   virtual void RunJavaScriptMessage(const std::wstring& message,
                                     const std::wstring& default_prompt,
                                     const GURL& frame_url,
                                     const int flags,
                                     IPC::Message* reply_msg,
                                     bool* did_suppress_message);
+  virtual void Close(RenderViewHost* render_view_host);
 
   // RenderViewHostDelegate::View
   virtual void CreateNewWindow(int route_id);
   virtual void CreateNewWidget(int route_id, bool activatable);
   virtual void ShowCreatedWindow(int route_id,
                                  WindowOpenDisposition disposition,
                                  const gfx::Rect& initial_pos,
                                  bool user_gesture,
                                  const GURL& creator_url);
   virtual void ShowCreatedWidget(int route_id,
@@ skipping 71 matching lines @@
   scoped_ptr<ExtensionFunctionDispatcher> extension_function_dispatcher_;
 
   // Only EXTENSION_TOOLSTRIP and EXTENSION_BACKGROUND_PAGE are used here,
   // others are not hostd by ExtensionHost.
   ViewType::Type extension_host_type_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_