Fix some straight-forward closure compiler errors.

chrome/browser/resources/hotword/launcher_manager.js

 // Copyright 2014 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('hotword', function() {
   'use strict';
 
   /**
    * Class used to manage the interaction between hotwording and the launcher
    * (app list).
    * @param {!hotword.StateManager} stateManager
    * @constructor
    * @extends {hotword.BaseSessionManager}
-   * @struct
+   * @class
    */
   function LauncherManager(stateManager) {
     hotword.BaseSessionManager.call(this,
                                     stateManager,
                                     hotword.constants.SessionSource.LAUNCHER);
   }
 
   LauncherManager.prototype = {
     __proto__: hotword.BaseSessionManager.prototype,
 
     /** @override */
     enabled: function() {
       return this.stateManager.isEnabled() &&
           !this.stateManager.isAlwaysOnEnabled();
     },
 
     /** @override */
     onSessionStop: function() {
       chrome.hotwordPrivate.setHotwordSessionState(false, function() {});
     }
   };
 
   return {
     LauncherManager: LauncherManager
   };
 });