MD Bookmarks: Restore any previously selected folder when clearing search

chrome/test/data/webui/md_bookmarks/router_test.js

 // Copyright 2017 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.
 
 suite('<bookmarks-router>', function() {
   var store;
   var router;
 
   function navigateTo(route) {
     window.history.replaceState({}, '', route);
     window.dispatchEvent(new CustomEvent('location-changed'));
   }
 
   setup(function() {
     store = new bookmarks.TestStore({
-      selectedId: '1',
+      selectedFolder: '1',
       search: {
         term: '',
       },
     });
     bookmarks.Store.instance_ = store;
 
     router = document.createElement('bookmarks-router');
     replaceBody(router);
   });
 
@@ skipping 44 matching lines @@
     }
 
     if (window.searchedQuery) {
       verifySearch(window.searchedQuery);
       return;
     }
 
     chrome.bookmarks.search = verifySearch;
   });
 });