Make TabContents ctor private; poke hole for existing callers.

chrome/browser/ui/webui/chrome_web_contents_handler.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/webui/chrome_web_contents_handler.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_navigator.h"
@@ skipping 64 matching lines @@
     const gfx::Rect& initial_pos,
     bool user_gesture) {
   if (!context)
     return;
 
   Profile* profile = Profile::FromBrowserContext(context);
   Browser* browser = browser::FindTabbedBrowser(profile, false);
   const bool browser_created = !browser;
   if (!browser)
     browser = new Browser(Browser::CreateParams(profile));
-  TabContents* tab_contents = new TabContents(new_contents);
+  TabContents* tab_contents =
+      TabContents::Factory::CreateTabContents(new_contents);
   chrome::NavigateParams params(browser, tab_contents);
   // TODO(pinkerton): no way to get a TabContents for this.
   // params.source_contents = source;
   params.disposition = disposition;
   params.window_bounds = initial_pos;
   params.window_action = chrome::NavigateParams::SHOW_WINDOW;
   params.user_gesture = true;
   chrome::Navigate(&params);
 
   // Close the browser if chrome::Navigate created a new one.
   if (browser_created && (browser != params.browser))
     browser->window()->Close();
 }