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

tests/standalone/src/ProcessExitTest.dart

Index: tests/standalone/src/ProcessExitTest.dart
diff --git a/tests/standalone/src/ProcessExitTest.dart b/tests/standalone/src/ProcessExitTest.dart
index 2f46cacf7c9481879ec979bfa12d1eaeee210341..fd2932cd9d9ff9fba6e3b4356f12093fb5c30b5d 100644
--- a/tests/standalone/src/ProcessExitTest.dart
+++ b/tests/standalone/src/ProcessExitTest.dart
@@ -1,10 +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.
 //
 // Process test program to test process communication.
 
 #library("ProcessExitTest");
+#import("dart:io");
 #source("ProcessTestUtil.dart");
 
 class ProcessExitTest {