Settings: Fix Site Details subpage routing

chrome/test/data/webui/settings/settings_subpage_test.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.
 
 cr.define('settings_subpage', function() {
   function registerTests() {
     suite('SettingsSubpage', function() {
-      test('can navigate to parent', function() {
+      test('navigates to parent when there is no history', function() {
         PolymerTest.clearBody();
 
-        // Choose CERTIFICATES since it is not a descendant of BASIC.
-        settings.navigateTo(settings.Route.CERTIFICATES);
+        // Pretend that we initially started on the CERTIFICATES route.
+        window.history.replaceState(
+            undefined, '', settings.Route.CERTIFICATES.path);
+        settings.initializeRouteFromUrl();
         assertEquals(settings.Route.CERTIFICATES, settings.getCurrentRoute());
 
         var subpage = document.createElement('settings-subpage');
         document.body.appendChild(subpage);
 
         MockInteractions.tap(subpage.$$('paper-icon-button'));
         assertEquals(settings.Route.PRIVACY, settings.getCurrentRoute());
       });
 
-      test('can navigate to grandparent using window.back()', function(done) {
+      test('navigates to any route via window.back()', function(done) {
         PolymerTest.clearBody();
 
         settings.navigateTo(settings.Route.BASIC);
         settings.navigateTo(settings.Route.SYNC);
         assertEquals(settings.Route.SYNC, settings.getCurrentRoute());
 
         var subpage = document.createElement('settings-subpage');
         document.body.appendChild(subpage);
 
         MockInteractions.tap(subpage.$$('paper-icon-button'));
 
-        // Since the previous history entry is an ancestor, we expect
-        // window.history.back() to be called and a popstate event to be fired.
         window.addEventListener('popstate', function(event) {
           assertEquals(settings.Route.BASIC, settings.getCurrentRoute());
           done();
         });
       });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });