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

tools/dom/templates/html/impl/impl_Document.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.
 
 part of $LIBRARYNAME;
 
 /**
  * The base class for all documents.
  *
  * Each web page loaded in the browser has its own [Document] object, which is
  * typically an [HtmlDocument].
  *
  * If you aren't comfortable with DOM concepts, see the Dart tutorial
  * [Target 2: Connect Dart & HTML](http://www.dartlang.org/docs/tutorials/connect-dart-html/).
  */
-$(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME extends Node $NATIVESPEC
+$(ANNOTATIONS)class $CLASSNAME extends Node $NATIVESPEC
 {
 
 $!MEMBERS
 
   /**
    * Finds all descendant elements of this document that match the specified
    * group of selectors.
    *
    * Unless your webpage contains multiple documents, the top-level queryAll
    * method behaves the same as this method, so you should use it instead to
    * save typing a few characters.
    *
    * [selectors] should be a string using CSS selector syntax.
    *     var items = document.queryAll('.itemClassName');
    *
    * For details about CSS selector syntax, see the
    * [CSS selector specification](http://www.w3.org/TR/css3-selectors/).
    */
   ElementList queryAll(String selectors) {
     return new _FrozenElementList._wrap($dom_querySelectorAll(selectors));
   }
 }