Close web contents modal dialogs on content load start

chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.h

 // Copyright (c) 2012 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_UI_GTK_TAB_MODAL_CONFIRM_DIALOG_GTK_H_
 #define CHROME_BROWSER_UI_GTK_TAB_MODAL_CONFIRM_DIALOG_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include "base/compiler_specific.h"
@@ skipping 20 matching lines @@
 
  private:
   friend class TabModalConfirmDialogTest;
 
   virtual ~TabModalConfirmDialogGtk();
 
   // TabModalConfirmDialog:
   virtual void AcceptTabModalDialog() OVERRIDE;
   virtual void CancelTabModalDialog() OVERRIDE;
 
-  // TabModalConfirmDialogCloseDelegate:
+  // TabModalConfirmDialogOperationsDelegate:
   virtual void CloseDialog() OVERRIDE;
+  virtual void SetPreventCloseOnLoadStart(bool prevent) OVERRIDE;
 
   // Callbacks:
   CHROMEGTK_CALLBACK_0(TabModalConfirmDialogGtk, void, OnAccept);
   CHROMEGTK_CALLBACK_0(TabModalConfirmDialogGtk, void, OnCancel);
   CHROMEGTK_CALLBACK_0(TabModalConfirmDialogGtk, void, OnDestroy);
   CHROMEGTK_CALLBACK_0(TabModalConfirmDialogGtk, void, OnLinkClicked);
 
+  content::WebContents* web_contents_;
+
   scoped_ptr<TabModalConfirmDialogDelegate> delegate_;
 
   GtkWidget* dialog_;
   GtkWidget* ok_;
   GtkWidget* cancel_;
 
   GtkWidget* window_;
 
   DISALLOW_COPY_AND_ASSIGN(TabModalConfirmDialogGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_TAB_MODAL_CONFIRM_DIALOG_GTK_H_