Factor out uses of the WebContentsModalDialog interface from platform-independent code

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"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/tab_modal_confirm_dialog.h"
 #include "chrome/browser/ui/gtk/constrained_window_gtk.h"
 #include "ui/base/gtk/gtk_signal.h"
 
+class ConstrainedWindowGtk;
 class TabModalConfirmDialogDelegate;
 
 namespace content {
 class WebContents;
 }
 
 // Displays a tab-modal dialog, i.e. a dialog that will block the current page
 // but still allow the user to switch to a different page.
 // To display the dialog, allocate this object on the heap. It will open the
 // dialog from its constructor and then delete itself when the user dismisses
@@ skipping 11 matching lines @@
 
  private:
   friend class TabModalConfirmDialogTest;
 
   virtual ~TabModalConfirmDialogGtk();
 
   // TabModalConfirmDialog:
   virtual void AcceptTabModalDialog() OVERRIDE;
   virtual void CancelTabModalDialog() OVERRIDE;
 
+  // TabModalConfirmDialogCloseDelegate:
+  virtual void CloseDialog() OVERRIDE;
+
   // Callbacks:
   CHROMEGTK_CALLBACK_0(TabModalConfirmDialogGtk, void, OnAccept);
   CHROMEGTK_CALLBACK_0(TabModalConfirmDialogGtk, void, OnCancel);
 
   scoped_ptr<TabModalConfirmDialogDelegate> delegate_;
 
   GtkWidget* dialog_;
   GtkWidget* ok_;
   GtkWidget* cancel_;
 
+  ConstrainedWindowGtk* window_;
+
   DISALLOW_COPY_AND_ASSIGN(TabModalConfirmDialogGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_TAB_MODAL_CONFIRM_DIALOG_GTK_H_