Update XMLHttpRequest documentation.

lib/html/doc/interface/HttpRequestUpload.dartdoc

 // 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.
 
 // WARNING:
 //   This file contains documentation that is merged into the real source.
 //   Do not make code changes here.
 
 /// @domName XMLHttpRequestUpload
-interface XMLHttpRequestUpload extends EventTarget {
+interface HttpRequestUpload extends EventTarget {
 
   /**
    * @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent
    */
-  XMLHttpRequestUploadEvents get on();
+  HttpRequestUploadEvents get on();
 
   /** @domName XMLHttpRequestUpload.addEventListener */
   void $dom_addEventListener(String type, EventListener listener, [bool useCapture]);
 
   /** @domName XMLHttpRequestUpload.dispatchEvent */
   bool $dom_dispatchEvent(Event evt);
 
   /** @domName XMLHttpRequestUpload.removeEventListener */
   void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]);
 }
 
-interface XMLHttpRequestUploadEvents extends Events {
+interface HttpRequestUploadEvents extends Events {
 
   EventListenerList get abort();
 
   EventListenerList get error();
 
   EventListenerList get load();
 
   EventListenerList get loadEnd();
 
   EventListenerList get loadStart();
 
   EventListenerList get progress();
 }