Add close to input stream and cleanup socket and streams

tests/stub-generator/test_config.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("stub_generator_test_config");
 
 #import("../../tools/testing/dart/test_suite.dart");
 
 class StubGeneratorTestSuite extends StandardTestSuite {
   String dartcPath;
@@ skipping 16 matching lines @@
     File orig = new File(filename);
     File stubs = new File(stubsFile);
     Expect.isTrue(filename.endsWith(".dart"));
     String baseName = filename.substring(0, filename.length - 5);
     String resultPath = '${baseName}-generatedTest.dart';
     File result = new File(resultPath);
     StringInputStream origStream =
         new StringInputStream(orig.openInputStream());
     StringInputStream stubsStream =
         new StringInputStream(stubs.openInputStream());
-    FileOutputStream resultStream = result.openOutputStream();
+    OutputStream resultStream = result.openOutputStream();
     var origLine;
 
     void writeResultLine(String line) {
       resultStream.write(line.charCodes());
       resultStream.write('\n'.charCodes());
     }
 
     // Step 3: Copy in the rest of the original file.
     void copyThirdPart() {
       origLine = origStream.readLine();
@@ skipping 89 matching lines @@
         String interfaceFile = splitIsolateStubsOptions[0];
         String classes = splitIsolateStubsOptions[1];
         generateTestCase(filename, interfaceFile, classes, (String filename) {
           createTestCase(filename, optionsFromFile['isNegative']);
           testGeneratorDone();
         });
       }
     }
   }
 }