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

tests/standalone/src/io/TimerRepeatTest.dart

Index: tests/standalone/src/io/TimerRepeatTest.dart
diff --git a/tests/standalone/src/io/TimerRepeatTest.dart b/tests/standalone/src/io/TimerRepeatTest.dart
index ceb5cb19e81c76e060feaf5da62819a5c3327586..fb2580931ee48f7a6f71c80c843b114f6fb0076f 100644
--- a/tests/standalone/src/io/TimerRepeatTest.dart
+++ b/tests/standalone/src/io/TimerRepeatTest.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
@@ -24,7 +24,7 @@ class TimerRepeatTest {
 
     _iteration = 0;
     _startTime = (new Date.now()).value;
-    timer = new Timer.repeating(timeoutHandler, _TIMEOUT);
+    timer = new Timer.repeating(_TIMEOUT, timeoutHandler);
   }
 
   static void testMain() {