Make the repeating argument to timers optional.

tests/standalone/src/SocketCloseTest.dart

 // Copyright (c) 2011, 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.
 //
 // Test socket close events.
 
 
 final SERVERSHUTDOWN = -1;
 final ITERATIONS = 10;
 
@@ skipping 30 matching lines @@
         _iterations = 0,
         _mode = mode {
     new SocketCloseServer().spawn().then((SendPort port) {
       _sendPort = port;
       start();
     });
   }
 
   void proceed() {
     if (_iterations < ITERATIONS) {
-      new Timer(sendData, 0, false);
+      new Timer(sendData, 0);
     } else {
       shutdown();
     }
   }
 
   void sendData(Timer timer) {
 
     void dataHandler() {
       switch (_mode) {
         case 0:
@@ skipping 236 matching lines @@
             Expect.equals(ITERATIONS, _dataEvents);
             Expect.equals(ITERATIONS, _closeEvents);
             break;
           default:
             Expect.fail("Unknown test mode");
         }
         Expect.equals(0, _errorEvents);
         _server.close();
         this.port.close();
       } else {
-        new Timer(waitForResult, 100, false);
+        new Timer(waitForResult, 100);
       }
     }
 
     this.port.receive((message, SendPort replyTo) {
       if (message != SERVERSHUTDOWN) {
         _errorEvents = 0;
         _dataEvents = 0;
         _closeEvents = 0;
         _iterations = 0;
         _mode = message;
         _server = new ServerSocket(HOST, 0, 10);
         Expect.equals(true, _server !== null);
         _server.connectionHandler = connectionHandler;
         _server.errorHandler = errorHandlerServer;
         replyTo.send(_server.port, null);
       } else {
-        new Timer(waitForResult, 0, false);
+        new Timer(waitForResult, 0);
       }
     });
   }
 
   ServerSocket _server;
   int _errorEvents;
   int _dataEvents;
   int _closeEvents;
   int _iterations;
   int _mode;
 }
 
 
 main() {
   SocketCloseTest.testMain();
 }