Merge mistake removed annotations for dart2js; re-added.

tools/dom/templates/html/impl/impl_Node.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;
 
 /**
  * Lazy implementation of the child nodes of an element that does not request
  * the actual child nodes of an element until strictly necessary greatly
  * improving performance for the typical cases where it is not required.
@@ skipping 289 matching lines @@
    * A list of this node's children.
    *
    * ## Other resources
    *
    * * [Node.childNodes]
    * (https://developer.mozilla.org/en-US/docs/Web/API/Node.childNodes)
    * from MDN.
    */
   @DomName('Node.childNodes')
   @DocsEditable()
+  @Returns('NodeList')
+  @Creates('NodeList')
   final List<Node> childNodes;
 
 $endif
 $!MEMBERS
 }