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

tests/standalone/src/ChunkedStreamTest.dart

Index: tests/standalone/src/ChunkedStreamTest.dart
diff --git a/tests/standalone/src/ChunkedStreamTest.dart b/tests/standalone/src/ChunkedStreamTest.dart
index 88c4033a9a9067f6e10967db6b66682d9b8378cb..453a4362f183554289b9bc8a9b71eac5ee0f468f 100644
--- a/tests/standalone/src/ChunkedStreamTest.dart
+++ b/tests/standalone/src/ChunkedStreamTest.dart
@@ -1,7 +1,9 @@
-// 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.
 
+#import("dart:io");
+
 void test1() {
   void testWithChunkSize(var data, int chunkSize, Function testDone) {
     InputStream s = new ListInputStream(data);