Remove redundant initialization of HttpAnalysisServer.socketServer.

pkg/analysis_server/lib/http_server.dart

 // Copyright (c) 2014, 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:io';
 
 import 'package:analysis_server/src/channel.dart';
 import 'package:analysis_server/src/get_handler.dart';
 import 'package:analysis_server/src/socket_server.dart';
 
 /**
  * Instances of the class [HttpServer] implement a simple HTTP server. The
  * primary responsibility of this server is to listen for an UPGRADE request and
  * to start an analysis server.
  */
 class HttpAnalysisServer {
   /**
    * An object that can handle either a WebSocket connection or a connection
    * to the client over stdio.
    */
-  SocketServer socketServer = new SocketServer();
+  SocketServer socketServer;
 
   /**
    * An object that can handle GET requests.
    */
   GetHandler getHandler;
 
   /**
    * Initialize a newly created HTTP server.
    */
   HttpAnalysisServer(this.socketServer);
@@ skipping 47 matching lines @@
   }
 
   /**
    * Begin serving HTTP requests over the given port.
    */
   void serveHttp(int port) {
     HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, port).then(_handleServer);
     print('Listening on port $port');
   }
 }