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

tests/standalone/src/TimerTest.dart

Index: tests/standalone/src/TimerTest.dart
diff --git a/tests/standalone/src/TimerTest.dart b/tests/standalone/src/TimerTest.dart
index 53ca27bdfb0dcba3de51d14102c85dd1cd2a564e..10cee0afbdaa7ea5c05bc923ee87a935c3711019 100644
--- a/tests/standalone/src/TimerTest.dart
+++ b/tests/standalone/src/TimerTest.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");
+
 class TimerTest {
 
   static final int _STARTTIMEOUT = 1050;