Remove TabContents from constrained windows.

chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/gtk/tab_modal_confirm_dialog_gtk.h"
 
 #include "base/message_loop.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
@@ skipping 53 matching lines @@
   ok_ = gtk_button_new_with_label(
       UTF16ToUTF8(delegate->GetAcceptButtonTitle()).c_str());
   const char* accept_button_icon_id = delegate->GetAcceptButtonIcon();
   if (accept_button_icon_id) {
     gtk_button_set_image(GTK_BUTTON(ok_), gtk_image_new_from_stock(
         accept_button_icon_id, GTK_ICON_SIZE_BUTTON));
   }
   g_signal_connect(ok_, "clicked", G_CALLBACK(OnAcceptThunk), this);
   gtk_box_pack_end(GTK_BOX(buttonBox), ok_, FALSE, TRUE, 0);
 
-  delegate->set_window(new ConstrainedWindowGtk(tab_contents, this));
+  delegate->set_window(
+      new ConstrainedWindowGtk(tab_contents->web_contents(), this));
 }
 
 GtkWidget* TabModalConfirmDialogGtk::GetWidgetRoot() {
   return dialog_;
 }
 
 GtkWidget* TabModalConfirmDialogGtk::GetFocusWidget() {
   return cancel_;
 }
 
@@ skipping 13 matching lines @@
   OnCancel(NULL);
 }
 
 void TabModalConfirmDialogGtk::OnAccept(GtkWidget* widget) {
   delegate_->Accept();
 }
 
 void TabModalConfirmDialogGtk::OnCancel(GtkWidget* widget) {
   delegate_->Cancel();
 }