Fix test.dart by not closing processes twice.

tools/testing/dart/test_runner.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.
 
 #library("test_runner");
 
 #import("status_file_parser.dart");
 #import("test_progress.dart");
 #import("test_suite.dart");
 
@@ skipping 167 matching lines @@
 
   void exitHandler(int exitCode) {
     new TestOutput(testCase, exitCode, timedOut, stdout,
                    stderr, new Date.now().difference(startTime));
     process.close();
     timeoutTimer.cancel();
     testCase.completed();
   }
 
   void compilerExitHandler(int exitCode) {
-    process.close();
     if (exitCode != 0) {
       exitHandler(exitCode);
     } else {
+      process.close();
       runCommand(testCase.executablePath, testCase.arguments, exitHandler);
     }
   }
       
   void makeReadHandler(StringInputStream source, List<String> destination) {
     return () {
       if (source.closed) return;  // TODO(whesse): Remove when bug is fixed.
       var line = source.readLine();
       while (null != line) {
         destination.add(line);
@@ skipping 264 matching lines @@
       if (test.configuration['component'] == 'dartc') {
         _ensureDartcBatchRunnersStarted(test.executablePath);
         _getDartcBatchRunnerProcess().startTest(test);
       } else {
         new RunningProcess(test).start();
       }
       _numProcesses++;
     }
   }
 }