MD Bookmarks: Remove '/?id=1' from URL when displaying Bookmarks Bar

chrome/browser/resources/md_bookmarks/util.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.
 
 /**
  * @fileoverview Utility functions for the Bookmarks page.
  */
 
 cr.define('bookmarks.util', function() {
   /**
@@ skipping 50 matching lines @@
       });
     }
 
     return nodeMap;
   }
 
   /** @return {!BookmarksPageState} */
   function createEmptyState() {
     return {
       nodes: {},
-      selectedFolder: '0',
+      selectedFolder: BOOKMARKS_BAR_ID,
       closedFolders: new Set(),
       prefs: {
         canEdit: true,
         incognitoAvailability: IncognitoAvailability.ENABLED,
       },
       search: {
         term: '',
         inProgress: false,
         results: [],
       },
@@ skipping 118 matching lines @@
     getDescendants: getDescendants,
     getDisplayedList: getDisplayedList,
     hasChildFolders: hasChildFolders,
     isShowingSearch: isShowingSearch,
     normalizeNode: normalizeNode,
     normalizeNodes: normalizeNodes,
     removeIdsFromMap: removeIdsFromMap,
     removeIdsFromSet: removeIdsFromSet,
   };
 });