Settings: Fix Site Details subpage routing

chrome/browser/resources/settings/settings_page/settings_subpage.js

 // Copyright 2016 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-subpage' shows a subpage beneath a subheader. The header contains
  * the subpage title and a back icon.
  */
 
@@ skipping 30 matching lines @@
     },
   },
 
   /** @private */
   onTapBack_: function() {
     var previousRoute =
         window.history.state &&
         assert(settings.getRouteForPath(
             /** @type {string} */ (window.history.state)));
 
-    if (previousRoute && previousRoute.contains(settings.getCurrentRoute()))
+    if (previousRoute)
       window.history.back();
     else
       settings.navigateTo(assert(settings.getCurrentRoute().parent));
   },
 
   /** @private */
   onSearchChanged_: function(e) {
     this.searchTerm = e.detail;
   },
 });