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

tests/standalone/src/TimerCancel1Test.dart

Index: tests/standalone/src/TimerCancel1Test.dart
diff --git a/tests/standalone/src/TimerCancel1Test.dart b/tests/standalone/src/TimerCancel1Test.dart
index 1a11d21b7e2fd210221176f7c6281da110741e75..8cd04af7205d4faa68c8dbb59e5a3f67d606f774 100644
--- a/tests/standalone/src/TimerCancel1Test.dart
+++ b/tests/standalone/src/TimerCancel1Test.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 another.
 class TimerCancel1Test {
   static void testOtherCancel() {