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 28 matching lines @@
   resetPermission: function() {
     var pref = this.getPref(
         this.computeCategoryExceptionsPrefName(this.category));
     delete pref.value[this.origin + ',' + this.origin];
     delete pref.value[this.origin + ',*'];
     this.setPrefValue(
         this.computeCategoryExceptionsPrefName(this.category), pref.value);
     this.$.details.hidden = true;
   },
 });