Get rid of duplicate 'tbody' keys in CUSTOM_PARENT_TAG_MAP.

client/dom/templates/html/frog/impl_Element.darttemplate

 // Copyright (c) 2012, 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 _ElementJs _element;
   final _HTMLCollectionJs _childElements;
 
@@ skipping 287 matching lines @@
 
 final _START_TAG_REGEXP = const RegExp('<(\\w+)');
 
 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
   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 136 matching lines @@
   /** @domName Window.getComputedStyle */
   Future<CSSStyleDeclaration> getComputedStyle(String pseudoElement) {
     return _createMeasurementFuture(() =>
             _window._getComputedStyle(this, pseudoElement),
         new Completer<CSSStyleDeclaration>());
   }
 
   _ElementJs clone(bool deep) native;
 $!MEMBERS
 }