MD Settings: fix side-menu items not visible.

chrome/browser/resources/settings/page_visibility.js

 // Copyright 2016 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.
 
 /**
  * Specifies page visibility in guest mode in cr and cros.
  * @typedef {{
  *   advancedSettings: (boolean|undefined),
  *   appearance: (boolean|undefined|AppearancePageVisibility),
  *   dateTime: (boolean|undefined|DateTimePageVisibility),
@@ skipping 42 matching lines @@
 var PrivacyPageVisibility;
 
 cr.define('settings', function() {
 
   /**
    * Dictionary defining page visibility.
    * This is only set when in guest mode. All pages are visible when not set
    * because polymer only notifies after a property is set.
    * @type {!GuestModePageVisibility}
    */
-  var pageVisibility = {};
+  var pageVisibility;
 
   if (loadTimeData.getBoolean('isGuest')) {
     // "if not chromeos" and "if chromeos" in two completely separate blocks
     // to work around closure compiler.
     // <if expr="not chromeos">
     pageVisibility = {
       passwordsAndForms: false,
       people: false,
       onStartup: false,
       reset: false,
@@ skipping 22 matching lines @@
       },
       downloads: {
         googleDrive: false,
       },
     };
     // </if>
   }
 
   return {pageVisibility: pageVisibility};
 });