Split dart:builtin into dart:builtin and dart:io.

tests/standalone/src/TimerCancel2Test.dart

Index: tests/standalone/src/TimerCancel2Test.dart
diff --git a/tests/standalone/src/TimerCancel2Test.dart b/tests/standalone/src/TimerCancel2Test.dart
index 405dc32719d66a58590952e9de3490e6281ffd7d..62714c057416e2187f3487a839fc3d6ba6f25020 100644
--- a/tests/standalone/src/TimerCancel2Test.dart
+++ b/tests/standalone/src/TimerCancel2Test.dart
@@ -1,7 +1,9 @@
-// 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.
 
+#import("dart:io");
+
 // Test that a timeout handler can cancel itself.
 class TimerCancel2Test {
   static void testSelfCancel() {