MD Settings: Content Settings: Support guest mode.

chrome/browser/resources/settings/privacy_page/privacy_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-privacy-page' is the settings page containing privacy and
  * security settings.
  */
 Polymer({
@@ skipping 13 matching lines @@
       type: Object,
       notify: true,
     },
 
     /**
      * Dictionary defining page visibility.
      * @type {!PrivacyPageVisibility}
      */
     pageVisibility: Object,
 
+    /** @private */
+    isGuest_: {
+      type: Boolean,
+      value: function() { return loadTimeData.getBoolean('isGuest'); }
+    },
+
 // <if expr="_google_chrome and not chromeos">
     // TODO(dbeam): make a virtual.* pref namespace and set/get this normally
     // (but handled differently in C++).
     /** @private {chrome.settingsPrivate.PrefObject} */
     metricsReportingPref_: {
       type: Object,
       value: function() {
         // TODO(dbeam): this is basically only to appease PrefControlBehavior.
         // Maybe add a no-validate attribute instead? This makes little sense.
         return /** @type {chrome.settingsPrivate.PrefObject} */({});
@@ skipping 166 matching lines @@
     return value ? this.i18n('siteSettingsProtectedContentEnable')
                  : this.i18n('siteSettingsBlocked');
   },
 
   /** @private */
   getProtectedContentIdentifiersLabel_: function(value) {
     return value ? this.i18n('siteSettingsProtectedContentEnableIdentifiers')
                  : this.i18n('siteSettingsBlocked');
   },
 });