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

tests/standalone/src/ListOutputStreamTest.dart

Index: tests/standalone/src/ListOutputStreamTest.dart
diff --git a/tests/standalone/src/ListOutputStreamTest.dart b/tests/standalone/src/ListOutputStreamTest.dart
index 16c85e12ca94240ebf71b4cda3a5451a3546be3f..84b10e115c251f4e493ae9f91c68904a359f6b70 100644
--- a/tests/standalone/src/ListOutputStreamTest.dart
+++ b/tests/standalone/src/ListOutputStreamTest.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");
+
 void testEmptyListOutputStream1() {
   OutputStream stream = new ListOutputStream();
   Expect.equals(null, stream.contents());