Close HttpServer in WebSocket tests.

tests/standalone/io/web_socket_test.dart

 // Copyright (c) 2013, 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
 
 import "dart:async";
@@ skipping 149 matching lines @@
           });
           webSocket.send(originalMessage);
         });
     });
   }
 
 
   void testDoubleCloseClient() {
     createServer().then((server) {
       server.transform(new WebSocketTransformer()).listen((webSocket) {
+        server.close();
         webSocket.listen((event) {
           if (event is CloseEvent) {
             webSocket.close();
           }
         });
       });
 
       createClient(server.port).then((webSocket) {
           webSocket.listen((event) {
             if (event is CloseEvent) {
               webSocket.close();
             }
           });
           webSocket.close();
         });
     });
   }
 
 
   void testDoubleCloseServer() {
     createServer().then((server) {
       server.transform(new WebSocketTransformer()).listen((webSocket) {
+        server.close();
         webSocket.listen((event) {
           if (event is CloseEvent) {
             webSocket.close();
           }
         });
         webSocket.close();
       });
 
       createClient(server.port).then((webSocket) {
           webSocket.listen((event) {
@@ skipping 136 matching lines @@
   SecureSocket.initialize(database: testPkcertDatabase.toNativePath(),
                           password: "dartdart");
 }
 
 
 main() {
   new SecurityConfiguration(secure: false).runTests();
   initializeSSL();
   new SecurityConfiguration(secure: true).runTests();
 }