Switch Extensions::TabHelper to use WebContents, WebContentsUserData.

chrome/browser/ui/browser_commands.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/browser_commands.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/bookmarks/bookmark_editor.h"
@@ skipping 997 matching lines @@
 void ViewSelectedSource(Browser* browser) {
   ViewSource(browser, GetActiveTabContents(browser));
 }
 
 bool CanViewSource(const Browser* browser) {
   return GetActiveWebContents(browser)->GetController().CanViewSource();
 }
 
 void CreateApplicationShortcuts(Browser* browser) {
   content::RecordAction(UserMetricsAction("CreateShortcut"));
-  GetActiveTabContents(browser)->extension_tab_helper()->
+  extensions::TabHelper::FromWebContents(GetActiveWebContents(browser))->
       CreateApplicationShortcuts();
 }
 
 bool CanCreateApplicationShortcuts(const Browser* browser) {
-  return GetActiveTabContents(browser)->extension_tab_helper()->
+  return extensions::TabHelper::FromWebContents(GetActiveWebContents(browser))->
       CanCreateApplicationShortcuts();
 }
 
 void ConvertTabToAppWindow(Browser* browser,
                            content::WebContents* contents) {
   const GURL& url = contents->GetController().GetActiveEntry()->GetURL();
   std::string app_name = web_app::GenerateApplicationNameFromURL(url);
 
   int index = browser->tab_strip_model()->GetIndexOfWebContents(contents);
   if (index >= 0)
     browser->tab_strip_model()->DetachTabContentsAt(index);
 
   Browser* app_browser = new Browser(
       Browser::CreateParams::CreateForApp(
           Browser::TYPE_POPUP, app_name, gfx::Rect(), browser->profile()));
   TabContents* tab_contents = TabContents::FromWebContents(contents);
   if (!tab_contents) {
     tab_contents =
         BrowserCommandsTabContentsCreator::CreateTabContents(contents);
   }
   app_browser->tab_strip_model()->AppendTabContents(tab_contents, true);
 
   contents->GetMutableRendererPrefs()->can_accept_load_drops = false;
   contents->GetRenderViewHost()->SyncRendererPrefs();
   app_browser->window()->Show();
 }
 
 }  // namespace chrome