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">
     /** @type {MetricsReporting} */
     metricsReporting_: Object,
 
     showRestart_: Boolean,
 // </if>
 
     /** @private */
     safeBrowsingExtendedReportingEnabled_: Boolean,
 
@@ skipping 136 matching lines @@
     return value ? this.i18n('siteSettingsProtectedContentEnable')
                  : this.i18n('siteSettingsBlocked');
   },
 
   /** @private */
   getProtectedContentIdentifiersLabel_: function(value) {
     return value ? this.i18n('siteSettingsProtectedContentEnableIdentifiers')
                  : this.i18n('siteSettingsBlocked');
   },
 });