[MD settings] flag to enable site settings All sites and Site details pages

chrome/browser/resources/settings/site_settings/site_list.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.
 
 /**
  * Enumeration mapping all possible controlled-by values for exceptions to
  * icons.
  * @enum {string}
  */
 var iconControlledBy = {
   'extension': 'cr:extension',
   'HostedApp': 'cr:extension',
   'platform_app': 'cr:extension',
   'policy' : 'cr:domain',
 };
 
 /**
  * @fileoverview
  * 'site-list' shows a list of Allowed and Blocked sites for a given
  * category.
  */
 Polymer({
 
   is: 'site-list',
 
   behaviors: [SiteSettingsBehavior, WebUIListenerBehavior],
 
   properties: {
+    /** @private */
+    enableSiteSettings_: {
+      type: Boolean,
+      value: function() {
+        return loadTimeData.getBoolean('enableSiteSettings');
+      },
+    },
+
     /**
      * The site that was selected by the user in the dropdown list.
      * @type {SiteException}
      */
     selectedSite: {
       type: Object,
       notify: true,
     },
 
     /**
@@ skipping 372 matching lines @@
       return false;
 
     return this.showSessionOnlyAction_;
   },
 
   /**
    * A handler for selecting a site (by clicking on the origin).
    * @private
    */
   onOriginTap_: function(event) {
+    if (!this.enableSiteSettings_)
+      return;
     this.selectedSite = event.model.item;
     settings.navigateTo(settings.Route.SITE_SETTINGS_SITE_DETAILS,
         new URLSearchParams('site=' + this.selectedSite.origin));
   },
 
   /**
    * A handler for activating one of the menu action items.
    * @param {!{model: !{item: !{origin: string}}}} event
    * @param {string} action The permission to set (Allow, Block, SessionOnly,
    *     etc).
@@ skipping 102 matching lines @@
     // is redundant to also list all the sites that are blocked.
     if (this.isAllowList_())
       return true;
 
     if (this.isSessionOnlyList_())
       return siteList.length > 0;
 
     return toggleState;
   },
 });