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

chrome/browser/resources/settings/default_browser_page/default_browser_page.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
  * 'settings-default-browser-page' is the settings page that contains
  * settings to change the default browser (i.e. which the OS will open).
  */
 Polymer({
@@ skipping 16 matching lines @@
   },
 
   /** @private {settings.DefaultBrowserBrowserProxy} */
   browserProxy_: null,
 
   /** @override */
   created: function() {
     this.browserProxy_ = settings.DefaultBrowserBrowserProxyImpl.getInstance();
   },
 
+  /** @override */
   ready: function() {
     this.addWebUIListener('settings.updateDefaultBrowserState',
         this.updateDefaultBrowserState_.bind(this));
 
     this.browserProxy_.requestDefaultBrowserState().then(
         this.updateDefaultBrowserState_.bind(this));
   },
 
   /**
    * @param {!DefaultBrowserInfo} defaultBrowserState
@@ skipping 14 matching lines @@
       this.maySetDefaultBrowser_ = true;
     else
       this.isUnknownError_ = true;
   },
 
   /** @private */
   onSetDefaultBrowserTap_: function() {
     this.browserProxy_.setAsDefaultBrowser();
   },
 });