Rework Timer interface.

tests/standalone/io/http_connection_close_test.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.
 //
 
 import "dart:async";
 import "dart:io";
 import "dart:uri";
 
 void testHttp10Close(bool closeRequest) {
@@ skipping 33 matching lines @@
 
 void testStreamResponse() {
   Timer timer;
   var server = new HttpServer();
   server.onError = (e) {
     server.close();
     timer.cancel();
   };
   server.listen("127.0.0.1", 0, backlog: 5);
   server.defaultRequestHandler = (var request, var response) {
-    timer = new Timer.repeating(10, (_) {
+    timer = new Timer.repeating(new Duration(milliseconds: 10), (_) {
       DateTime now = new DateTime.now();
       try {
         response.outputStream.writeString(
             'data:${now.millisecondsSinceEpoch}\n\n');
       } catch (e) {
         timer.cancel();
         server.close();
       }
     });
   };
@@ skipping 13 matching lines @@
   connection.onError = (e) => Expect.isTrue(e is HttpException);
 }
 
 main() {
   testHttp10Close(false);
   testHttp10Close(true);
   testHttp11Close(false);
   testHttp11Close(true);
   testStreamResponse();
 }