Rework Timer interface.

tests/standalone/io/test_runner_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:isolate";
 import "dart:async";
 import "dart:utf";
 import "../../../tools/testing/dart/test_runner.dart";
 import "../../../tools/testing/dart/test_suite.dart";
 import "../../../tools/testing/dart/status_file_parser.dart";
@@ skipping 96 matching lines @@
   } else {
     switch (arguments[0]) {
       case 'pass':
         return;
       case 'fail-unexpected':
       case 'fail':
         Expect.fail("This test always fails, to test the test scripts.");
         break;
       case 'timeout':
         // Run for 10 seconds, then exit.  This tests a 2 second timeout.
-        new Timer(10 * 1000, (t){ });
+        new Timer(new Duration(seconds: 10), (){ });
         break;
       default:
         throw "Unknown option ${arguments[0]} passed to test_runner_test";
     }
   }
 }