Switch Extensions::TabHelper to use WebContents, WebContentsUserData.

chrome/browser/extensions/api/extension_action/extension_page_actions_api.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/extensions/api/extension_action/extension_page_actions_api.h"
 
 #include <string>
 
 #include "base/string_number_conversions.h"
 #include "chrome/browser/extensions/api/extension_action/extension_page_actions_api_constants.h"
@@ skipping 81 matching lines @@
   if (!entry || url != entry->GetURL().spec()) {
     error_ = ExtensionErrorUtils::FormatErrorMessage(kUrlNotActiveError, url);
     return false;
   }
 
   // Set visibility and broadcast notifications that the UI should be updated.
   page_action->SetAppearance(
       tab_id, enable ? ExtensionAction::ACTIVE : ExtensionAction::INVISIBLE);
   page_action->SetTitle(tab_id, title);
   page_action->SetIconIndex(tab_id, icon_id);
-  contents->extension_tab_helper()->location_bar_controller()->NotifyChange();
+  extensions::TabHelper::FromWebContents(contents->web_contents())->
+      location_bar_controller()->NotifyChange();
 
   return true;
 }
 
 bool EnablePageActionsFunction::RunImpl() {
   return SetPageActionEnabled(true);
 }
 
 bool DisablePageActionsFunction::RunImpl() {
   return SetPageActionEnabled(false);
 }