Change the handling of closing sockets

tests/standalone/src/ProcessStdoutTest.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.
 //
 // Process test program to test process communication.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
@@ skipping 17 matching lines @@
     process.start();
 
     int received = 0;
 
     void readData() {
       List<int> buffer = input.read();
       for (int i = 0; i < buffer.length; i++) {
         Expect.equals(data[received + i], buffer[i]);
       }
       received += buffer.length;
-      if (received == BUFFERSIZE) {
-        process.close();
-      }
     }
 
     void streamClosed() {
       Expect.equals(BUFFERSIZE, received);
+      process.close();
     }
 
     output.write(data);
-    output.end();
+    output.close();
     input.dataHandler = readData;
     input.closeHandler = streamClosed;
   }
 
   static void testMain() {
     testStdout();
   }
 }
 
 main() {
-  ProcessStdoutTest.testMain();
+  ProcessStdoutTest.testStdout();
 }