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

tests/standalone/src/ProcessStartExceptionTest.dart

Index: tests/standalone/src/ProcessStartExceptionTest.dart
diff --git a/tests/standalone/src/ProcessStartExceptionTest.dart b/tests/standalone/src/ProcessStartExceptionTest.dart
index ef63a7beda9d5b5242b13fbd5764745e98845239..3d52dfb3564fa294d05fe988ec625be9852dfd5c 100644
--- a/tests/standalone/src/ProcessStartExceptionTest.dart
+++ b/tests/standalone/src/ProcessStartExceptionTest.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.
 //
 // Process test program to test process communication.
 
+#import("dart:io");
+
 class ProcessStartExceptionTest {
 
   static void testStartError() {