Upgrade checkbox, pref-tracker, and prefs to 0.8

chrome/browser/resources/settings/prefs/prefs.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
  * 'cr-settings-prefs' is an element which serves as a model for
  * interaction with settings which are stored in Chrome's
  * Preferences.
  *
  * Example:
  *
  *    <cr-settings-prefs id="prefs"></cr-settings-prefs>
  *    <cr-settings-a11y-page prefs="{{this.$.prefs}}"></cr-settings-a11y-page>
  *
  * @group Chrome Settings Elements
  * @element cr-settings-a11y-page
  */
 (function() {
   'use strict';
 
-  Polymer('cr-settings-prefs', {
-    publish: {
+  Polymer({
+    is: 'cr-settings-prefs',
+
+    properties: {
       /**
        * Object containing all preferences.
-       *
-       * @attribute settings
-       * @type {Object}
-       * @default null
        */
-      settings: null,
+      settings: {
+        type: Object,
+        value: function() { return {}; },
+        notify: true,
+      },
     },
 
     /** @override */
     created: function() {
       CrSettingsPrefs.isInitialized = false;
-      this.settings = {};
 
       chrome.settingsPrivate.onPrefsChanged.addListener(
           this.onPrefsChanged_.bind(this));
       chrome.settingsPrivate.getAllPrefs(this.onPrefsFetched_.bind(this));
     },
 
     /**
      * Called when prefs in the underlying Chrome pref store are changed.
      * @param {!Array<!chrome.settingsPrivate.PrefObject>} prefs The prefs that
      *     changed.
@@ skipping 76 matching lines @@
 
         chrome.settingsPrivate.setPref(
             propertyPath,
             newValue,
             /* pageId */ '',
             /* callback */ function() {});
       }
     },
   });
 })();