Revert "Making all DOM types abstract and removing superfluous Dartium constructors."

tools/dom/templates/html/impl/impl_HTMLTableRowElement.darttemplate

 // Copyright (c) 2013, 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.
 
 part of $LIBRARYNAME;
 
 @DocsEditable
-$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
+$(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
   @DomName('HTMLTableRowElement.cells')
   List<TableCellElement> get cells =>
       new _WrappedList<TableCellElement>($dom_cells);
 
   TableCellElement addCell() {
     return insertCell(-1);
   }
 
   TableCellElement insertCell(int index) => $dom_insertCell(index);
 
 $!MEMBERS}