Fix some straight-forward closure compiler errors.

chrome/browser/resources/hotword/always_on_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 always-on hotwording. Automatically starts hotwording
    * on startup, if always-on is enabled, and starts/stops hotwording at
    * appropriate times.
    * @param {!hotword.StateManager} stateManager
    * @constructor
    * @extends {hotword.BaseSessionManager}
-   * @struct
+   * @class

[Dan Beam, 2014/10/21 03:07:39]

why both @class and @constructor?

[Anand Mistry (off Chromium), 2014/10/21 03:42:21]

Dunno. I was following some other code which did this. Removing @class has no
effect, so it looks like it's unnecessary. So I've removed that annotation
everywhere.

    */
   function AlwaysOnManager(stateManager) {
     hotword.BaseSessionManager.call(this,
                                     stateManager,
                                     hotword.constants.SessionSource.ALWAYS);
   }
 
   AlwaysOnManager.prototype = {
     __proto__: hotword.BaseSessionManager.prototype,
 
-    /** override */
+    /** @override */
      enabled: function() {
        return this.stateManager.isAlwaysOnEnabled();
      },
 
-    /** override */
+    /** @override */
     updateListeners: function() {
       hotword.BaseSessionManager.prototype.updateListeners.call(this);
       if (this.enabled())
         this.startSession_();
     }
   };
 
   return {
     AlwaysOnManager: AlwaysOnManager
   };
 });