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

frog/leg/tools/mini_parser.dart

Index: frog/leg/tools/mini_parser.dart
diff --git a/frog/leg/tools/mini_parser.dart b/frog/leg/tools/mini_parser.dart
index aced575ae127852369b82b4b3deab1a9d14a7073..df5ca8f24cd62dd413e91d2767eca36f549a81d7 100644
--- a/frog/leg/tools/mini_parser.dart
+++ b/frog/leg/tools/mini_parser.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('parser');
 
+#import('dart:io');
+
 #import('../../../utils/utf8/utf8.dart');
 
 #import('../elements/elements.dart');