Rename XMLHttpRequest to HttpRequest.

samples/chat/dart_client/chat.dart

 // 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.
 
 #library("chat.dart");
 #import("dart:html");
 #import("dart:json");
 
 void main() {
   new Chat().start();
@@ skipping 140 matching lines @@
         pollServer();
       }
     }
   }
 
   void onPollFailed() {
     showStatus("Failed to receive messages. Please try again later.");
     uiJoin();
   }
 
-  XMLHttpRequest sendRequest(String url, Map json, var onSuccess, var onError) {
-    XMLHttpRequest request = new XMLHttpRequest();
+  HttpRequest sendRequest(String url, Map json, var onSuccess, var onError) {
+    HttpRequest request = new HttpRequest();
     request.on.readyStateChange.add((Event event) {
       if (request.readyState != 4) return;
       if (request.status == 200) {
         onSuccess(JSON.parse(request.responseText));
       } else {
         onError();
       }
     });
     request.open("POST", url, true);
     request.setRequestHeader("Content-Type", "text/plain;charset=UTF-8");
@@ skipping 130 matching lines @@
   InputElement _handleInput;
 
   Element _joinSection;
   Element _chatSection;
   InputElement _messageInput;
   Element _messages;
   Element _statusText;
 
   String _session = null;
   int _nextMessage = 0;
-  XMLHttpRequest _pollRequest = null;
+  HttpRequest _pollRequest = null;
 
 }