Second round of cleanups for new optional parameter semantics.

runtime/bin/http_impl.dart

 // Copyright (c) 2012, 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.
 
 class _HttpHeaders implements HttpHeaders {
   _HttpHeaders() : _headers = new Map<String, List<String>>();
 
   List<String> operator[](String name) {
     name = name.toLowerCase();
     return _headers[name];
@@ skipping 1430 matching lines @@
   Function _handler;
 }
 
 
 // HTTP server waiting for socket connections. The connections are
 // managed by the server and as requests are received the request.
 class _HttpServer implements HttpServer {
   _HttpServer() : _connections = new Set<_HttpConnection>(),
                   _handlers = new List<_RequestHandlerRegistration>();
 
-  void listen(String host, int port, [int backlog = 128]) {
+  void listen(String host, int port, {int backlog: 128}) {
     listenOn(new ServerSocket(host, port, backlog));
     _closeServer = true;
   }
 
   void listenOn(ServerSocket serverSocket) {
     void onConnection(Socket socket) {
       // Accept the client connection.
       _HttpConnection connection = new _HttpConnection(this);
       connection._connectionEstablished(socket);
       _connections.add(connection);
@@ skipping 829 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }