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

samples/total/src/TotalRunner.dart

 #!/usr/bin/env dart
-// 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.
 
 #library("total:runner");
 
+#import('dart:io');
+
 typedef void ExitCallback(int status, String exitString);
 
 void main() {
   String SERVER_EXEC_PATH = './TotalServer.dart';
   final int RESTART_STATUS = 42;
   final int EXIT_STATUS = 0;
 
   void keepServerRunning(int status, ServerRunner runner) {
     switch (status) {
       case RESTART_STATUS:
@@ skipping 45 matching lines @@
         } else {
           String line = readSoFar.toString();
           readSoFar.clear();
           if (line.length != 0) {
             print(line);
           }
         }
       });
   }
 }