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

tests/standalone/src/ProcessStdIOScript.dart

Index: tests/standalone/src/ProcessStdIOScript.dart
diff --git a/tests/standalone/src/ProcessStdIOScript.dart b/tests/standalone/src/ProcessStdIOScript.dart
index 6c195928be486593e2cb894f69a45933b131d6c2..6ceaeb4f3b9eda781babd9abe13781901fe32b5c 100644
--- a/tests/standalone/src/ProcessStdIOScript.dart
+++ b/tests/standalone/src/ProcessStdIOScript.dart
@@ -1,9 +1,11 @@
-// 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.
 //
 // Utility script to echo stdin to stdout or stderr or both.
 
+#import("dart:io");
+
 main() {
   var options = new Options();
   if (options.arguments.length > 0) {