Make TabContents ctor private; poke hole for existing callers.

chrome/browser/ui/tab_contents/test_tab_contents.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/tab_contents/test_tab_contents.h"
 
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/browser/web_contents.h"
 
 using content::WebContents;
 
 TabContentsTestHarness::TabContentsTestHarness()
     : ChromeRenderViewHostTestHarness() {
 }
 
 TabContentsTestHarness::~TabContentsTestHarness() {
 }
 
 WebContents* TabContentsTestHarness::web_contents() {
   return tab_contents_.get() ? tab_contents_->web_contents() : NULL;
 }
 
 TabContents* TabContentsTestHarness::tab_contents() {
   return tab_contents_.get();
 }
 
 void TabContentsTestHarness::SetContents(WebContents* contents) {
-  tab_contents_.reset(contents ? new TabContents(contents) : NULL);
+  tab_contents_.reset(
+      contents ? TabContents::Factory::CreateTabContents(contents) : NULL);
 }
 
 void TabContentsTestHarness::SetUp() {
   ChromeRenderViewHostTestHarness::SetUp();
   SetContents(CreateTestWebContents());
 }
 
 void TabContentsTestHarness::TearDown() {
   tab_contents_.reset();
 
   // Make sure that we flush any messages related to WebContents destruction
   // before we destroy the browser context.
   MessageLoop::current()->RunAllPending();
 
   // Release the browser context on the UI thread.
   message_loop_.DeleteSoon(FROM_HERE, browser_context_.release());
   message_loop_.RunAllPending();
 
   ChromeRenderViewHostTestHarness::TearDown();
 }