Use dom-if to hide settings pages and show explicitly.

chrome/browser/resources/settings/site_settings/site_details_permission.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
  * 'site-details-permission' handles showing the state of one permission, such
  * as Geolocation, for a given origin.
  *
  * Example:
@@ skipping 13 matching lines @@
   properties: {
     /**
      * Preferences state.
      */
     prefs: {
       type: Object,
       notify: true,
     },
 
     /**
-     * The ID of the category this widget is displaying data for.
-     */
-    category: Number,
-
-    /**
      * The origin, which this permission affects.
      */
     origin: {
       type: String,
       observer: 'initialize_',
     },
 
     i18n_: {
       readOnly: true,
       type: Object,
@@ skipping 38 matching lines @@
    * @param {!{target: !{selectedItem: !{innerText: string}}}} event
    */
   onPermissionMenuIronSelect_: function(event) {
     var action = event.target.selectedItem.innerText;
     var value = (action == this.i18n_.allowAction) ?
         settings.PermissionValues.ALLOW :
         settings.PermissionValues.BLOCK;
     this.setCategoryPermissionForOrigin(this.origin, value, this.category);
   },
 });