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

tests/standalone/src/ProcessInvalidArgumentsTest.dart

Index: tests/standalone/src/ProcessInvalidArgumentsTest.dart
diff --git a/tests/standalone/src/ProcessInvalidArgumentsTest.dart b/tests/standalone/src/ProcessInvalidArgumentsTest.dart
index f02a7bc9aab6d95c69ca67fe48d644cc9f0d5f7a..46e6ac3f12200396c85402dcc74920cfdd487c9f 100644
--- a/tests/standalone/src/ProcessInvalidArgumentsTest.dart
+++ b/tests/standalone/src/ProcessInvalidArgumentsTest.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 that invalid arguments throw exceptions.
 
+#import("dart:io");
+
 void main() {
   Expect.throws(() => new Process.start(["true"], []),
                 (e) => e is ProcessException);