Make TabContents ctor private; poke hole for existing callers.

chrome/browser/ui/gtk/web_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/web_dialog_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/browser_dialogs.h"
@@ skipping 186 matching lines @@
 
   // To make sure the default key bindings can still work, such as Escape to
   // close the dialog.
   gtk_bindings_activate_event(GTK_OBJECT(dialog_), os_event);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebDialogGtk:
 
 gfx::NativeWindow WebDialogGtk::InitDialog() {
-  tab_.reset(new TabContents(WebContents::Create(
+  tab_.reset(TabContents::Factory::CreateTabContents(WebContents::Create(
       browser_context(), NULL, MSG_ROUTING_NONE, NULL)));
   tab_->web_contents()->SetDelegate(this);
 
   // This must be done before loading the page; see the comments in
   // WebDialogUI.
   WebDialogUI::SetDelegate(tab_->web_contents(), this);
 
   tab_->web_contents()->GetController().LoadURL(
       GetDialogContentURL(),
       content::Referrer(),
@@ skipping 36 matching lines @@
   }
 
   gtk_widget_show_all(dialog_);
 
   return GTK_WINDOW(dialog_);
 }
 
 void WebDialogGtk::OnResponse(GtkWidget* dialog, int response_id) {
   OnDialogClosed(std::string());
 }