Remove deprecated ms arguments for Timer and Future.

tests/standalone/io/raw_secure_server_closing_test.dart

 // Copyright (c) 2013, 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
 
 import "dart:async";
@@ skipping 81 matching lines @@
     // Pause the server socket subscription and resume it after having
     // connected a number client sockets. Then connect more client
     // sockets.
     subscription.pause();
     var connectCount = 0;
     for (int i = 0; i < socketCount; i++) {
       RawSecureSocket.connect(HOST_NAME, server.port).then((connection) {
         connection.shutdown(SocketDirection.SEND);
       });
     }
-    new Timer(500, (_) {
+    new Timer(const Duration(milliseconds: 500), () {
       subscription.resume();
       resumed = true;
       for (int i = 0; i < socketCount; i++) {
         RawSecureSocket.connect(HOST_NAME, server.port).then((connection) {
           connection.shutdown(SocketDirection.SEND);
         });
       }
     });
   });
 }
@@ skipping 37 matching lines @@
                           useBuiltinRoots: false);
 
   testCloseOneEnd("client");
   testCloseOneEnd("server");
   testCloseBothEnds();
   testCloseServer();
   testPauseServerSocket();
   // TODO(whesse): Add testPauseSocket from raw_socket_test.dart.
   // TODO(whesse): Add testCancelResubscribeSocket from raw_socket_test.dart.
 }