Wait for output file to close before deleting the file in pipe test.

tests/standalone/src/StreamPipeTest.dart

 // 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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 #library("StreamPipeTest");
@@ skipping 79 matching lines @@
         tempDir.createTempSync();
         var dstFileName = tempDir.path + "/readline_test1.dat";
         var dstFile = new File(dstFileName);
         dstFile.createSync();
         var fileOutput = dstFile.openOutputStreamSync();
 
         socketInput.closeHandler = () {
           // Check that the resulting file is equal to the initial
           // file.
           bool result = compareFileContent(srcFileName, dstFileName);
-          new File(dstFileName).deleteSync();
-          tempDir.deleteSync();
-          Expect.isTrue(result);
+          fileOutput.closeHandler = () {
+            new File(dstFileName).deleteSync();
+            tempDir.deleteSync();
+            Expect.isTrue(result);
 
-          _socket.close();
+            _socket.close();
 
-          // Run this twice.
-          if (count++ < 2) {
-            runTest();
-          } else {
-            shutdown();
-          }
+            // Run this twice.
+            if (count++ < 2) {
+              runTest();
+            } else {
+              shutdown();
+            }
+          };
         };
 
         socketInput.pipe(fileOutput);
       };
 
       fileInput.pipe(socketOutput);
     }
 
     // Connect to the server.
     _socket = new Socket(TestingServer.HOST, _port);
@@ skipping 162 matching lines @@
   srcStream.pipe(dstStream, close: false);
 }
 
 
 main() {
   testFileToFilePipe1();
   testFileToFilePipe2();
   testFileToFilePipe3();
   PipeServerGame echoServerGame = new PipeServerGame.start();
 }