Use the same IP address for both server and client in web_socket_pipe_test

tests/standalone/io/web_socket_pipe_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 "package:expect/expect.dart";
 import "dart:async";
 import "dart:io";
 
 class IdentityTransformer extends StreamEventTransformer {
   void handleData(data, sink) => sink.add(data);
 }
 
 class ReverseStringTransformer extends StreamEventTransformer {
   void handleData(String data, sink) {
     var sb = new StringBuffer();
     for (int i = data.length - 1; i >= 0; i--) sb.write(data[i]);
     sink.add(sb.toString());
   }
 }
 
 testPipe({int messages, bool transform}) {
   HttpServer.bind("127.0.0.1", 0).then((server) {
     server.listen((request) {
       WebSocketTransformer.upgrade(request).then((websocket) {
-          Future done;
-          if (transform) {
-            done = websocket
-                .transform(new ReverseStringTransformer())
-                .pipe(websocket);
-          } else {
-            done = websocket.pipe(websocket);
-          }
-          done.then((_) => server.close());
+        (transform ? websocket.transform(new ReverseStringTransformer())
+                   : websocket)
+            .pipe(websocket)
+            .then((_) => server.close());
       });
     });
-    WebSocket.connect("ws://localhost:${server.port}/").then((client) {
+    WebSocket.connect("ws://127.0.0.1:${server.port}/").then((client) {
       var count = 0;
       next() {
         if (count < messages) {
           client.add("Hello");
         } else {
           client.close();
         }
       }
 
       next();
-      client.listen((data) {
-          count++;
-          if (transform) {
-            Expect.equals("olleH", data);
-          } else {
-            Expect.equals("Hello", data);
-          }
-          next();
-        },
-        onDone: () => print("Client received close"));
+      client.listen(
+          (data) {
+            count++;
+            if (transform) {
+              Expect.equals("olleH", data);
+            } else {
+              Expect.equals("Hello", data);
+            }
+            next();
+          },
+          onDone: () => print("Client received close"));
     });
   });
 }
 
 void main() {
   testPipe(messages: 0, transform: false);
   testPipe(messages: 0, transform: true);
   testPipe(messages: 1, transform: false);
   testPipe(messages: 1, transform: true);
   testPipe(messages: 10, transform: false);
   testPipe(messages: 10, transform: true);
 }