Make TabContents ctor private; poke hole for existing callers.

chrome/browser/instant/instant_loader.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/instant/instant_loader.h"
 
 #include "chrome/browser/content_settings/tab_specific_content_settings.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/instant/instant_loader_delegate.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 246 matching lines @@
                                                       supports_instant);
 }
 
 // InstantLoader ---------------------------------------------------------------
 
 InstantLoader::InstantLoader(InstantLoaderDelegate* delegate,
                              const std::string& instant_url,
                              const TabContents* tab_contents)
     : loader_delegate_(delegate),
       preview_contents_(
-          new TabContents(content::WebContents::CreateWithSessionStorage(
-            tab_contents->profile(), NULL, MSG_ROUTING_NONE,
-            tab_contents->web_contents(),
-            tab_contents->web_contents()->GetController().
+          TabContents::Factory::CreateTabContents(
+              content::WebContents::CreateWithSessionStorage(
+                  tab_contents->profile(), NULL, MSG_ROUTING_NONE,
+                  tab_contents->web_contents(),
+                  tab_contents->web_contents()->GetController().
                                           GetSessionStorageNamespaceMap()))),
       supports_instant_(false),
       instant_url_(instant_url) {
 }
 
 InstantLoader::~InstantLoader() {
   if (preview_contents())
     preview_contents_->web_contents()->SetDelegate(NULL);
 }
 
@@ skipping 118 matching lines @@
                                            TabContents* new_tc) {
   DCHECK(old_tc == preview_contents_);
   CleanupPreviewContents();
   // We release here without deleting so that the caller still has the
   // responsibility for deleting the TabContents.
   ignore_result(preview_contents_.release());
   preview_contents_.reset(new_tc);
   SetupPreviewContents();
   loader_delegate_->SwappedTabContents(this);
 }