Fix standalone tests that didn't delete the temporary directories they created.

tests/standalone/src/StreamPipeTest.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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 #library("StreamPipeTest");
@@ skipping 78 matching lines @@
         var dstFileName = tempDir.path + "/readline_test1.dat";
         var dstFile = new File(dstFileName);
         dstFile.createSync();
         var fileOutput = dstFile.openOutputStream();
 
         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);
 
           _socket.close();
 
           // Run this twice.
           if (count++ < 2) {
             runTest();
           } else {
             shutdown();
           }
@@ skipping 54 matching lines @@
 
   var tempDir = new Directory('');
   tempDir.createTempSync();
   String dstFileName = tempDir.path + "/readline_test1.dat";
   new File(dstFileName).createSync();
   var dstStream = new File(dstFileName).openOutputStream();
 
   srcStream.closeHandler = () {
     bool result = compareFileContent(srcFileName, dstFileName);
     new File(dstFileName).deleteSync();
+    tempDir.deleteSync();
     Expect.isTrue(result);
   };
 
   srcStream.pipe(dstStream);
 }
 
 
 // Test piping from one file to another and write additional data to
 // the output stream after piping finished.
 testFileToFilePipe2() {
@@ skipping 20 matching lines @@
     Expect.isTrue(compareFileContent(srcFileName,
                                      dstFileName,
                                      count: srcLength));
     dst.setPositionSync(srcLength);
     var data = new List<int>(1);
     var read2 = dst.readListSync(data, 0, 1);
     Expect.equals(32, data[0]);
     src.closeSync();
     dst.closeSync();
     dstFile.deleteSync();
+    tempDir.deleteSync();
   };
 
   srcStream.pipe(dstStream, close: false);
 }
 
 
 // Test piping two copies of one file to another.
 testFileToFilePipe3() {
   String srcFileName =
       getDataFilename("tests/standalone/src/readline_test1.dat");
@@ skipping 19 matching lines @@
       Expect.isTrue(compareFileContent(srcFileName,
                                        dstFileName,
                                        count: srcLength));
       Expect.isTrue(compareFileContent(srcFileName,
                                        dstFileName,
                                        file2Offset: srcLength,
                                        count: srcLength));
       src.closeSync();
       dst.closeSync();
       dstFile.deleteSync();
+      tempDir.deleteSync();
     };
 
     // Pipe another copy of the source file.
     srcStream2.pipe(dstStream);
   };
 
   srcStream.pipe(dstStream, close: false);
 }
 
 
 main() {
   testFileToFilePipe1();
   testFileToFilePipe2();
   testFileToFilePipe3();
   PipeServerGame echoServerGame = new PipeServerGame.start();
 }