Remove dead script_badge code.

chrome/browser/resources/extensions/extension_info.js

-// 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.
-
-cr.define('extension_info', function() {
-  'use strict';
-
-  /**
-   * Initialize the info popup.
-   */
-  function load() {
-    $('extension-item').style.backgroundImage =
-        'url(' + loadTimeData.getString('icon') + ')';
-    $('extension-title-running').textContent =
-        loadTimeData.getStringF('isRunning', loadTimeData.getString('name'));
-  }
-
-  return {
-    load: load
-  };
-});
-
-window.addEventListener('DOMContentLoaded', extension_info.load);