[MD settings] remove unused categorySelected property

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({
   is: 'settings-site-settings-page',
 
   behaviors: [SiteSettingsBehavior],
 
   properties: {
     /** @private */
     enableSiteSettings_: {
       type: Boolean,
       value: function() {
         return loadTimeData.getBoolean('enableSiteSettings');
       },
     },
-
-    /**
-     * The category selected by the user.
-     */
-    categorySelected: {
-      type: String,
-      notify: true,
-    },
   },
 
   ready: function() {
     this.ContentSettingsTypes = settings.ContentSettingsTypes;
     this.ALL_SITES = settings.ALL_SITES;
 
     // Look up the default value for each category and show it.
     this.setDefaultValue_(this.ContentSettingsTypes.AUTOMATIC_DOWNLOADS,
         '#automaticDownloads');
     this.setDefaultValue_(this.ContentSettingsTypes.BACKGROUND_SYNC,
@@ skipping 28 matching lines @@
   /**
    * Navigate to the route specified in the event dataset.
    * @param {!Event} event The tap event.
    * @private
    */
   onTapNavigate_: function(event) {
     var dataSet = /** @type {{route: string}} */(event.currentTarget.dataset);
     settings.navigateTo(settings.Route[dataSet.route]);
   },
 });