[MD Bookmarks] Remove the bookmarks-sidebar element.

chrome/test/data/webui/md_bookmarks/folder_node_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.
 
-suite('<bookmarks-sidebar>', function() {
-  var sidebar;
+suite('<bookmarks-folder-node>', function() {
+  var rootNode;
   var store;
 
   setup(function() {
     store = new bookmarks.TestStore({
       nodes: testTree(
           createFolder(
               '1',
               [
                 createFolder(
                     '2',
                     [
                       createFolder('3', []),
                       createFolder('4', []),
                     ]),
                 createItem('5'),
               ]),
           createFolder('7', [])),
     });
     bookmarks.Store.instance_ = store;
 
-    sidebar = document.createElement('bookmarks-sidebar');
-    replaceBody(sidebar);
+    rootNode = document.createElement('bookmarks-folder-node');
+    rootNode.itemId = '0';
+    rootNode.depth = -1;
+    replaceBody(rootNode);
     Polymer.dom.flush();
   });
 
   test('selecting and deselecting folders dispatches action', function() {
-    var rootFolders =
-        sidebar.$['folder-tree'].querySelectorAll('bookmarks-folder-node');
+    var rootFolders = rootNode.root.querySelectorAll('bookmarks-folder-node');
     var firstGen = rootFolders[0].$['descendants'].querySelectorAll(
         'bookmarks-folder-node');
     var secondGen =
         firstGen[0].$['descendants'].querySelectorAll('bookmarks-folder-node');
 
     // Select nested folder.
     firedId = '';
     MockInteractions.tap(secondGen[0].$['folder-label']);
     assertEquals('select-folder', store.lastAction.name);
     assertEquals(secondGen[0].itemId, store.lastAction.id);
 
     // Select folder in a separate subtree.
     firedId = '';
     MockInteractions.tap(rootFolders[1].$['folder-label']);
     assertEquals('select-folder', store.lastAction.name);
     assertEquals(rootFolders[1].itemId, store.lastAction.id);
   });
 
   test('depth calculation', function() {
-    var rootFolders =
-        sidebar.$['folder-tree'].querySelectorAll('bookmarks-folder-node');
+    var rootFolders = rootNode.root.querySelectorAll('bookmarks-folder-node');
     var firstGen = rootFolders[0].$['descendants'].querySelectorAll(
         'bookmarks-folder-node');
     var secondGen =
         firstGen[0].$['descendants'].querySelectorAll('bookmarks-folder-node');
 
     Array.prototype.forEach.call(rootFolders, function(f) {
       assertEquals(0, f.depth);
       assertEquals('0', f.style.getPropertyValue('--node-depth'));
     });
     Array.prototype.forEach.call(firstGen, function(f) {
       assertEquals(1, f.depth);
       assertEquals('1', f.style.getPropertyValue('--node-depth'));
     });
     Array.prototype.forEach.call(secondGen, function(f) {
       assertEquals(2, f.depth);
       assertEquals('2', f.style.getPropertyValue('--node-depth'));
     });
   });
 
   test('doesn\'t highlight selected folder while searching', function() {
-    var rootFolders =
-        sidebar.$['folder-tree'].querySelectorAll('bookmarks-folder-node');
+    var rootFolders = rootNode.root.querySelectorAll('bookmarks-folder-node');
 
     store.data.selectedFolder = '1';
     store.notifyObservers();
 
     assertEquals('1', rootFolders['0'].itemId);
     assertTrue(rootFolders['0'].isSelectedFolder_);
 
     store.data.search = {
       term: 'test',
       inProgress: false,
       results: ['3'],
     };
     store.notifyObservers();
 
     assertFalse(rootFolders['0'].isSelectedFolder_);
   });
 });