This CL contains all of the changes for splitting off all of the native

tools/dom/templates/html/impl/impl_XMLHttpRequest.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;
 
+$!TOPLEVEL
+
  /**
   * A client-side XHR request for getting data from a URL,
   * formally known as XMLHttpRequest.
   *
   * HttpRequest can be used to obtain data from HTTP and FTP protocols,
   * and is useful for AJAX-style page updates.
   *
   * The simplest way to get the contents of a text file, such as a
   * JSON-formatted file, is with [getString].
   * For example, the following code gets the contents of a JSON file
@@ skipping 348 matching lines @@
         headers[key] = '${headers[key]}, $value';
       } else {
         headers[key] = value;
       }
     }
     return headers;
   }
 
 $!MEMBERS
 }