Make the repeating argument to timers optional.

samples/chat/http_impl.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.
 
 // Global constants.
 class Const {
   // Bytes for "HTTP/1.0".
   static final HTTP10 = const [72, 84, 84, 80, 47, 49, 46, 48];
   // Bytes for "HTTP/1.1".
   static final HTTP11 = const [72, 84, 84, 80, 47, 49, 46, 49];
@@ skipping 1469 matching lines @@
                 SocketConnection socketConn = connections.last();
                 if (socketConn._idleTime(now).inMilliseconds >
                     DEFAULT_EVICTION_TIMEOUT) {
                   connections.removeLast();
                 } else {
                   break;
                 }
               }
             });
       }
-      _evictionTimer = new Timer(_handleEviction, 10000, true);
+      _evictionTimer = new Timer.repeating(_handleEviction, 10000);
     }
 
     // Return connection.
     sockets.addFirst(socketConn);
     socketConn._markReturned();
   }
 
   void set openHandler(void callback(HTTPClientRequest request)) {
     _openHandler = callback;
   }
 
   var _openHandler;
   Map<String, Queue<SocketConnection>> _openSockets;
   Timer _evictionTimer;
   bool _shutdown;  // Has this HTTP client been shutdown?
 }