Switch Extensions::TabHelper to use WebContents, WebContentsUserData.

chrome/browser/ui/views/tabs/browser_tab_strip_controller.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/views/tabs/browser_tab_strip_controller.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/tab_helper.h"
@@ skipping 508 matching lines @@
       tab_contents->favicon_tab_helper()->GetFavicon().AsImageSkia();
   data->network_state = TabContentsNetworkState(contents);
   data->title = contents->GetTitle();
   data->url = contents->GetURL();
   data->loading = contents->IsLoading();
   data->crashed_status = contents->GetCrashedStatus();
   data->incognito = contents->GetBrowserContext()->IsOffTheRecord();
   data->show_icon = tab_contents->favicon_tab_helper()->ShouldDisplayFavicon();
   data->mini = model_->IsMiniTab(model_index);
   data->blocked = model_->IsTabBlocked(model_index);
-  data->app = tab_contents->extension_tab_helper()->is_app();
+  data->app = extensions::TabHelper::FromWebContents(contents)->is_app();
   data->mode = browser_->search_model()->mode().mode;
   // Get current gradient background animation to paint.
   data->gradient_background_opacity = browser_->search_delegate()->
       toolbar_search_animator().GetGradientOpacity();
 }
 
 void BrowserTabStripController::SetTabDataAt(
     TabContents* contents,
     int model_index) {
   TabRendererData data;
@@ skipping 39 matching lines @@
   SetTabRendererDataFromModel(contents->web_contents(), index, &data, NEW_TAB);
   tabstrip_->AddTabAt(index, data, is_active);
 }
 
 void BrowserTabStripController::UpdateLayoutType() {
   bool adjust_layout = false;
   TabStripLayoutType layout_type =
       DetermineTabStripLayout(g_browser_process->local_state(), &adjust_layout);
   tabstrip_->SetLayoutType(layout_type, adjust_layout);
 }