Remove "listening on port $port" message.

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';
@@ skipping 67 matching lines @@
     response.headers.add(HttpHeaders.CONTENT_TYPE, "text/plain");
     response.write('Not found');
     response.close();
   }
 
   /**
    * 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');
+    stderr.writeln('Listening on port $port');

[Brian Wilkerson, 2014/04/15 23:19:34]

Somehow, writing non-error messages to stderr seems wrong. It might be better to
simply remove it. I think it was originally added primarily as a user-level
confirmation that the server was running, and it isn't clear to me that we need
it at all. That said, I'll leave it to you to decide.

   }
 }