[MD settings] specify @override on created, ready, and attached

chrome/browser/resources/settings/site_settings/site_settings_behavior.js

 // Copyright 2015 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.
 
 /**
  * @fileoverview Behavior common to Site Settings classes.
  */
 
 
 /**
@@ skipping 21 matching lines @@
     category: String,
 
     /**
      * The browser proxy used to retrieve and change information about site
      * settings categories and the sites within.
      * @type {settings.SiteSettingsPrefsBrowserProxy}
      */
     browserProxy: Object,
   },
 
+  /** @override */
   created: function() {
     this.browserProxy =
         settings.SiteSettingsPrefsBrowserProxyImpl.getInstance();
   },
 
+  /** @override */
   ready: function() {
     this.PermissionValues = settings.PermissionValues;
   },
 
   /**
    * Ensures the URL has a scheme (assumes http if omitted).
    * @param {string} url The URL with or without a scheme.
    * @return {string} The URL with a scheme, or an empty string.
    */
   ensureUrlHasScheme: function(url) {
@@ skipping 124 matching lines @@
       setting: exception.setting,
       enforcement: enforcement,
       controlledBy: controlledBy,
     };
   },
 
 };
 
 /** @polymerBehavior */
 var SiteSettingsBehavior = [SiteSettingsBehaviorImpl];