Refactor AppModalDialogQueue and move JS Alert boxes into a MVC.

chrome/browser/jsmessage_box_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_JSMESSAGE_BOX_HANDLER_H_
 #define CHROME_BROWSER_JSMESSAGE_BOX_HANDLER_H_
 
 #include <string>
 
 #include "chrome/common/ipc_message.h"
 
 class GURL;
 class WebContents;
 
 // Creates and runs a Javascript Message Box dialog.
 // The dialog type is specified within |dialog_flags|, the
 // default static display text is in |message_text| and if the dialog box is
 // a user input prompt() box, the default text for the text field is in
 // |default_prompt_text|. The result of the operation is returned using
 // |reply_msg|.
 void RunJavascriptMessageBox(WebContents* web_contents,
                              const GURL& frame_url,
                              int dialog_flags,
                              const std::wstring& message_text,
                              const std::wstring& default_prompt_text,
                              bool display_suppress_checkbox,
                              IPC::Message* reply_msg);
 
+// This will display a modal dialog box with a header and footer asking the
+// the user if they wish to navigate away from a page, with additional text
+// |message_text| between the header and footer. The users response is
+// returned to the renderer using |reply_msg|.
+void RunBeforeUnloadDialog(WebContents* web_contents,
+                           const std::wstring& message_text,
+                           IPC::Message* reply_msg);
+
 #endif // CHROME_BROWSER_JSMESSAGE_BOX_HANDLER_H_