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

tests/standalone/src/ListInputStreamTest.dart

 // Copyright (c) 2011, 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 testEmptyListInputStream() {
   InputStream stream = new ListInputStream([]);
   ReceivePort donePort = new ReceivePort();
 
   void onData() {
     throw "No data expected";
   }
 
   void onClose() {
     donePort.toSendPort().send(null);
@@ skipping 248 matching lines @@
   testListInputStream1();
   testListInputStream2();
   testListInputStreamPipe1();
   testListInputStreamPipe2();
   testListInputClose1();
   testListInputClose2();
   testDynamicListInputStream();
   testDynamicListInputClose1();
   testDynamicListInputClose2();
 }