Second round of cleanups for new optional parameter semantics.

tests/standalone/io/http_redirect_test.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.
 //
 
 #import("dart:io");
 #import("dart:uri");
 
 HttpServer setupServer() {
   HttpServer server = new HttpServer();
-  server.listen("127.0.0.1", 0, 5);
+  server.listen("127.0.0.1", 0, backlog: 5);
 
   void addRedirectHandler(int number, int statusCode) {
     server.addRequestHandler(
        (HttpRequest request) => request.path == "/$number",
        (HttpRequest request, HttpResponse response) {
        response.headers.set(HttpHeaders.LOCATION,
                             "http://127.0.0.1:${server.port}/${number + 1}");
        response.statusCode = statusCode;
        response.outputStream.close();
      });
@@ skipping 103 matching lines @@
     server.close();
     client.shutdown();
   };
 }
 
 main() {
   testManualRedirect();
   testAutoRedirect();
   testRedirectLoop();
 }