Get rid of duplicate 'tbody' keys in CUSTOM_PARENT_TAG_MAP.

client/html/src/ElementWrappingImplementation.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // TODO(jacobr): use Lists.dart to remove some of the duplicated functionality.
 class _ChildrenElementList implements ElementList {
   // Raw Element.
   final _element;
   final _childElements;
 
@@ skipping 491 matching lines @@
 final _START_TAG_REGEXP = const RegExp('<(\\w+)');
 
 /** @domName Element, HTMLElement */
 class ElementWrappingImplementation extends NodeWrappingImplementation implements Element {
   
     static final _CUSTOM_PARENT_TAG_MAP = const {
       'body' : 'html',
       'head' : 'html',
       'caption' : 'table',
       'td': 'tr',
-      'tbody': 'table',
       'colgroup': 'table',
       'col' : 'colgroup',
       'tr' : 'tbody',
       'tbody' : 'table',
       'tfoot' : 'table',
       'thead' : 'table',
       'track' : 'audio',
     };
 
   /** @domName Document.createElement */
@@ skipping 259 matching lines @@
 
   ElementEvents get on() {
     if (_on === null) {
       _on = new ElementEventsImplementation._wrap(_ptr);
     }
     return _on;
   }
 
   Element clone(bool deep) => super.clone(deep);
 }