options: fix guest mode showing advanced settings bug.

chrome/browser/resources/options/browser_options.js

 // Copyright (c) 2012 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.
 
 cr.exportPath('options');
 
 /**
  * @typedef {{actionLinkText: (string|undefined),
  *            childUser: (boolean|undefined),
  *            hasError: (boolean|undefined),
@@ skipping 816 matching lines @@
 
     /**
      * Shows the given section.
      * @param {HTMLElement} section The section to be shown.
      * @param {HTMLElement} container The container for the section. Must be
      *     inside of |section|.
      * @param {boolean} animate Indicate if the expansion should be animated.
      * @private
      */
     showSection_: function(section, container, animate) {
+      if (section == $('advanced-settings') &&
+          !loadTimeData.getBoolean('allowAdvancedSettings')) {
+        return;
+      }
       // Delay starting the transition if animating so that hidden change will
       // be processed.
       if (animate) {
         this.animatedSectionHeightChange_(section, container, true);
       } else {
         section.hidden = false;
         section.style.height = 'auto';
       }
     },
 
@@ skipping 1398 matching lines @@
       }
       button.textContent = loadTimeData.getString(strId);
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });