Remove more libraries directives from server

pkg/analysis_server/lib/src/server/stdio_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 stdio.server;
-
 import 'dart:async';
 import 'dart:io';
 
 import 'package:analysis_server/src/channel/byte_stream_channel.dart';
 import 'package:analysis_server/src/socket_server.dart';
 
 /**
  * Instances of the class [StdioServer] implement a simple server operating
  * over standard input and output. The primary responsibility of this server
  * is to split incoming messages on newlines and pass them along to the
@@ skipping 16 matching lines @@
    *
    * Return a future that will be completed when stdin closes.
    */
   Future serveStdio() {
     ByteStreamServerChannel serverChannel = new ByteStreamServerChannel(
         stdin, stdout, socketServer.instrumentationService);
     socketServer.createAnalysisServer(serverChannel);
     return serverChannel.closed;
   }
 }