MD Settings: hide people section when signin is disabled (e.g. by policy)

chrome/browser/resources/settings/people_page/people_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-people-page' is the settings page containing sign-in settings.
  */
 Polymer({
   is: 'settings-people-page',
@@ skipping 13 matching lines @@
      */
     prefs: {
       type: Object,
       notify: true,
     },
 
     /**
      * The current sync status, supplied by SyncBrowserProxy.
      * @type {?settings.SyncStatus}
      */
-    syncStatus: Object,
+    syncStatus: {
+      type: Object,
+      notify: true,
+    },
 
     /**
      * The currently selected profile icon URL. May be a data URL.
      */
     profileIconUrl_: String,
 
     /**
      * The current profile name.
      */
     profileName_: String,
@@ skipping 307 matching lines @@
 
   /**
    * @param {string} iconUrl
    * @return {string} A CSS imageset for multiple scale factors.
    * @private
    */
   getIconImageset_: function(iconUrl) {
     return cr.icon.getImage(iconUrl);
   },
 });