Switch Extensions::TabHelper to use WebContents, WebContentsUserData.

chrome/browser/extensions/api/tabs/execute_code_in_tab_function.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/tabs/execute_code_in_tab_function.h"
 
 #include "base/bind.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/tabs/tabs.h"
@@ skipping 247 matching lines @@
       break;
     case InjectDetails::RUN_AT_DOCUMENT_START:
       run_at = UserScript::DOCUMENT_START;
       break;
     case InjectDetails::RUN_AT_DOCUMENT_END:
       run_at = UserScript::DOCUMENT_END;
       break;
   }
   CHECK_NE(UserScript::UNDEFINED, run_at);
 
-  contents->extension_tab_helper()->script_executor()->ExecuteScript(
-      extension->id(),
-      script_type,
-      code_string,
-      frame_scope,
-      run_at,
-      ScriptExecutor::ISOLATED_WORLD,
-      base::Bind(&ExecuteCodeInTabFunction::OnExecuteCodeFinished, this));
+  extensions::TabHelper::FromWebContents(contents->web_contents())->
+      script_executor()->ExecuteScript(
+          extension->id(),
+          script_type,
+          code_string,
+          frame_scope,
+          run_at,
+          ScriptExecutor::ISOLATED_WORLD,
+          base::Bind(&ExecuteCodeInTabFunction::OnExecuteCodeFinished, this));
   return true;
 }