[HBD] Update MD Site Settings Plugins section to show 3rd mode checkbox.

chrome/browser/resources/settings/site_settings_page/site_settings_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-site-settings-page' is the settings page containing privacy and
  * security site settings.
  */
 Polymer({
@@ skipping 35 matching lines @@
     this.setDefaultValue_(this.ContentSettingsTypes.POPUPS, '#popups');
     this.setDefaultValue_(this.ContentSettingsTypes.PROTOCOL_HANDLERS,
         '#handlers');
     this.setDefaultValue_(this.ContentSettingsTypes.UNSANDBOXED_PLUGINS,
         '#unsandboxedPlugins');
   },
 
   setDefaultValue_: function(category, id) {
     this.browserProxy.getDefaultValueForContentType(
         category).then(function(setting) {
-          var enabled = this.computeIsSettingEnabled(category, setting);
-          var description = this.computeCategoryDesc(category, enabled, false);
+          var description = this.computeCategoryDesc(category, setting, false);
           this.$$(id).innerText = description;
         }.bind(this));
   },
 
   /**
    * Handles selection of a single category and navigates to the details for
    * that category.
    * @param {!Event} event The tap event.
    */
   onTapCategory: function(event) {
     var category = event.currentTarget.getAttribute('category');
     if (category == settings.ALL_SITES)
       settings.navigateTo(settings.Route.SITE_SETTINGS_ALL);
     else
       settings.navigateTo(this.computeCategoryRoute(category));
   },
 });