Moves over remaining .dart code references to 'factory' in interface declartions to 'default'

client/dom/generated/src/interface/XMLHttpRequest.dart

 // Copyright (c) 2011, 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.
 
 // WARNING: Do not edit - generated code.
 
-interface XMLHttpRequest extends EventTarget factory _XMLHttpRequestFactoryProvider {
+interface XMLHttpRequest extends EventTarget default _XMLHttpRequestFactoryProvider {
 
   XMLHttpRequest();
 
 
   static final int DONE = 4;
 
   static final int HEADERS_RECEIVED = 2;
 
   static final int LOADING = 3;
 
@@ skipping 40 matching lines @@
   void open(String method, String url, [bool async, String user, String password]);
 
   void overrideMimeType(String override);
 
   void removeEventListener(String type, EventListener listener, [bool useCapture]);
 
   void send([var data]);
 
   void setRequestHeader(String header, String value);
 }