Implement automatically generated constructors for frog and dartium dart:html

client/dom/templates/html/frog/html_frog.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.
 
 // DO NOT EDIT
 // Auto-generated dart:html library.
 
 #library("html");
 
 $!GENERATED_DART_FILES
 
 #source('../dom/src/EventListener.dart');
 #source('../dom/src/KeyLocation.dart');
 #source('../dom/src/KeyName.dart');
 #source('../dom/src/ReadyState.dart');
 #source('../dom/src/TimeoutHandler.dart');
 #source('../dom/src/_Collections.dart');
+#source('../dom/src/_XMLHttpRequestUtils.dart');
 #source('../html/src/Measurement.dart');
 #source('../html/src/shared_FactoryProviders.dart');
 #source('../html/src/frog_FactoryProviders.dart');
 #source('../html/src/_Testing.dart');
 #source('../html/src/Device.dart');
 #source('../dom/src/_ListIterators.dart');
 #source('../dom/src/_Lists.dart');
 
 _WindowImpl _cachedWindow;
 _DocumentImpl _cachedDocument;
@@ skipping 31 matching lines @@
     _init();
   }
   return _cachedDocument;
 }
 
 _DocumentImpl get _document() native "return window.document.documentElement;";
 
 // Workaround for tags like <cite> that lack their own Element subclass --
 // Dart issue 1990.
 class _HTMLElementImpl extends _ElementImpl native "*HTMLElement" {
-}
+}