Delete debugging change that slipped in.

tools/testing/dart/http_server.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.
 
 library http_server;
 
 import 'dart:io';
 import 'dart:isolate';
 import 'test_suite.dart';  // For TestUtils.
 import '../../../pkg/args/lib/args.dart';
@@ skipping 77 matching lines @@
         var requestPathStr = requestPath.toNativePath().substring(
             requestPath.toNativePath().indexOf(packagesDirName));
         path = packageRootDir.append(requestPathStr);
         file = new File(path.toNativePath());
       }
       file.exists().then((exists) {
         if (exists) {
           if (allowedPort != -1) {
             // Allow loading from localhost:$allowedPort in browsers.
             resp.headers.set("Access-Control-Allow-Origin",
-                "http://127.0.0.1:${allowedPort+1}");
+                "http://127.0.0.1:$allowedPort");
             resp.headers.set('Access-Control-Allow-Credentials', 'true');
           } else {
             // No allowedPort specified. Allow from anywhere (but cross-origin
             // requests *with credentials* will fail because you can't use "*").
             resp.headers.set("Access-Control-Allow-Origin", "*");
           }
           if (path.toNativePath().endsWith('.html')) {
             resp.headers.set('Content-Type', 'text/html');
           } else if (path.toNativePath().endsWith('.js')) {
             resp.headers.set('Content-Type', 'application/javascript');
@@ skipping 25 matching lines @@
     });
 
     httpServer.listen(host, port);
     serverList.add(httpServer);
   }
 
   static terminateHttpServers() {
     for (var server in serverList) server.close();
   }
 }