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

frog/tests/frog/src/FrogServerTest.dart

Index: frog/tests/frog/src/FrogServerTest.dart
diff --git a/frog/tests/frog/src/FrogServerTest.dart b/frog/tests/frog/src/FrogServerTest.dart
index 5643e0bed5dbc2c13071347054f5d7c9883f5dbc..1be0b693b8c6ffa3e4c803b893e6cf5d693aca18 100644
--- a/frog/tests/frog/src/FrogServerTest.dart
+++ b/frog/tests/frog/src/FrogServerTest.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.
 
 #library('FrogServerTest');
 
+#import('dart:io');
+
 #import('../../../server/frog_server.dart', prefix: 'frogserver');
 
 // TODO(jmesserly): more sane way to import JSON on the VM