Update Timer API to take the callback as the last parameter.

tests/standalone/src/io/SocketCloseTest.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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 //
 // Test socket close events.
@@ skipping 16 matching lines @@
         _errorEvents = 0,
         _iterations = 0 {
     new SocketCloseServer().spawn().then((SendPort port) {
       _sendPort = port;
       start();
     });
   }
 
   void proceed() {
     if (_iterations < ITERATIONS) {
-      new Timer(sendData, 0);
+      new Timer(0, sendData);
     } else {
       shutdown();
     }
   }
 
   void sendData(Timer timer) {
 
     void dataHandler() {
       switch (_mode) {
         case 0:
@@ skipping 275 matching lines @@
             Expect.equals(ITERATIONS, _closeEvents);
             break;
           default:
             Expect.fail("Unknown test mode");
         }
         Expect.equals(0, _errorEvents);
         _server.close();
         this.port.close();
         _donePort.send(null);
       } else {
-        new Timer(waitForResult, 100);
+        new Timer(100, waitForResult);
       }
     }
 
     this.port.receive((message, SendPort replyTo) {
       _donePort = replyTo;
       if (message != SERVERSHUTDOWN) {
         _readBytes = 0;
         _errorEvents = 0;
         _dataEvents = 0;
         _closeEvents = 0;
         _iterations = 0;
         _mode = message;
         _server = new ServerSocket(HOST, 0, 10);
         Expect.equals(true, _server !== null);
         _server.onConnection = (connection) {
           var data = new ConnectionData(connection);
           connectionHandler(data);
         };
         _server.onError = errorHandlerServer;
         replyTo.send(_server.port, null);
       } else {
-        new Timer(waitForResult, 0);
+        new Timer(0, waitForResult);
       }
     });
   }
 
   ServerSocket _server;
   SendPort _donePort;
   int _readBytes;
   int _errorEvents;
   int _dataEvents;
   int _closeEvents;
@@ skipping 14 matching lines @@
   var tests = 7;
   var port = new ReceivePort();
   var completed = 0;
   port.receive((message, ignore) {
     if (++completed == tests) port.close();
   });
   for (var i = 0; i < tests; i++) {
     new SocketClose.start(i, port.toSendPort());
   }
 }