MD Settings: cr/cros - Guest mode page visibility

chrome/browser/resources/settings/appearance_page/appearance_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.
 
 /**
  * 'settings-appearance-page' is the settings page containing appearance
  * settings.
  *
  * Example:
  *
@@ skipping 202 matching lines @@
   /**
    * @param {number} percent The integer percentage of the page zoom.
    * @private
    */
   zoomLevelChanged_: function(percent) {
     // The |percent| may be undefined on startup.
     if (percent === undefined)
       return;
     chrome.settingsPrivate.setDefaultZoomPercent(percent);
   },
+
+  /**
+   * @param {boolean} isFirst
+   * @return {string} 'first' if the argument is true or empty otherwise.
+   * @private
+   */
+  getFirst_: function(isFirst) {
+    return isFirst ? 'first' : '';
+  }
 });