Site Settings: Give each category its own route.

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.
  *
  * Example:
@@ skipping 29 matching lines @@
 
     /**
      * The origin selected by the user.
      */
     originSelected: {
       type: String,
       observer: 'onSelectedOriginChanged_',
     }
   },
 
+  ready: function() {
+    this.ContentSettingsTypes = settings.ContentSettingsTypes;
+  },
+
   /** @private */
   onManageCertificatesTap_: function() {
     this.$.pages.setSubpageChain(['manage-certificates']);
   },
 
   /** @private */
   onSiteSettingsTap_: function() {
     this.$.pages.setSubpageChain(['site-settings']);
   },
 
   /** @private */
   onClearBrowsingDataTap_: function() {
     this.$.pages.setSubpageChain(['clear-browsing-data']);
   },
 
   onSelectedOriginChanged_: function() {
     this.$.pages.setSubpageChain(
         ['site-settings', 'site-settings-category', 'site-details']);
   },
 });