fix safari test

tools/testing/dart/http_server.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.
 
 library http_server;
 
 import 'dart:async';
 import 'dart:io';
 
 import 'dart:convert' show
@@ skipping 242 matching lines @@
     });
   }
 
   void _handleWebSocketRequest(HttpRequest request) {
     WebSocketTransformer.upgrade(request).then((websocket) {
       // We ignore failures to write to the socket, this happens if the browser
       // closes the connection.
       websocket.done.catchError((_) {});
       websocket.listen((data) {
         websocket.add(data);
-        websocket.close();
+        if (data == 'close-with-error') {
+          // Note: according to the web-sockets spec, a reason longer than 123
+          // bytes will produce a SyntaxError on the client.
+          websocket.close(WebSocketStatus.UNSUPPORTED_DATA, 'X' * 124);
+        } else {
+          websocket.close();
+        }
       }, onError: (e) {
         DebugLogger.warning('HttpServer: error while echoing to WebSocket', e);
       });
     }).catchError((e) {
       DebugLogger.warning(
           'HttpServer: error while transforming to WebSocket', e);
     });
   }
 
   Path _getFilePathFromRequestPath(String urlRequestPath) {
@@ skipping 182 matching lines @@
 class _Entry implements Comparable {
   final String name;
   final String displayName;
 
   _Entry(this.name, this.displayName);
 
   int compareTo(_Entry other) {
     return name.compareTo(other.name);
   }
 }