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

tests/standalone/src/DirectoryInvalidArgumentsTest.dart

Index: tests/standalone/src/DirectoryInvalidArgumentsTest.dart
diff --git a/tests/standalone/src/DirectoryInvalidArgumentsTest.dart b/tests/standalone/src/DirectoryInvalidArgumentsTest.dart
index b83e191c64c97294cac8f3bd1a3912c023e958de..ee5984481d50948661b1448ab3503ae07af75738 100644
--- a/tests/standalone/src/DirectoryInvalidArgumentsTest.dart
+++ b/tests/standalone/src/DirectoryInvalidArgumentsTest.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 DirectoryInvalidArgumentsTest {
   static void testFailingList(Directory d, var recursive) {
     int errors = 0;