Don't close stdout/stderr in CompactProgressIndicator

tools/testing/dart/test_progress.dart

 // Copyright (c) 2013, 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 test_progress;
 
 import "dart:io";
 import "dart:io" as io;
 import "http_server.dart" as http_server;
 import "status_file_parser.dart";
@@ skipping 411 matching lines @@
 }
 
 abstract class CompactIndicator extends ProgressIndicator {
   CompactIndicator(DateTime startTime)
       : super(startTime);
 
   void allDone() {
     if (_failedTests > 0) {
       // We may have printed many failure logs, so reprint the summary data.
       _printProgress();
-      print('');
     }
-    stdout.close();
-    stderr.close();
+    print('');
   }
 
   void _printStartProgress(TestCase test) => _printProgress();
   void _printDoneProgress(TestCase test) => _printProgress();
 
   void _printProgress();
 }
 
 
 class CompactProgressIndicator extends CompactIndicator {
@@ skipping 64 matching lines @@
       print('@@@STEP_FAILURE@@@');
       print('@@@BUILD_STEP $stepName failures@@@');
       for (String line in _failureSummary) {
         print(line);
       }
       print('');
     }
     super.allDone();
   }
 }