Fix issues with test.dart that appeared on Mac.

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.
 
 HttpServer _httpServer;
 
-// TODO(ager): Get rid of this when we get the Mac to behave.
-int _retries = 10;
-
-Future<bool> startHttpServer(String host, int port) {
-  var completer = new Completer();
+void startHttpServer(String host, int port) {
   var basePath = TestUtils.dartDir();
   _httpServer = new HttpServer();
   _httpServer.onError = (e) {
     // Consider errors in the builtin http server fatal.
     // Intead of just throwing the exception we print
     // a message that makes it clearer what happened.
     print('Test http server error: $e');
     exit(1);
   };
   _httpServer.defaultRequestHandler = (request, resp) {
@@ skipping 11 matching lines @@
           resp.headers.set("Access-Control-Allow-Origin", "*");
           file.openInputStream().pipe(resp.outputStream);
         } else {
           resp.statusCode = HttpStatus.NOT_FOUND;
           resp.outputStream.close();
         }
       });
     }
   };
 
-  // TODO(ager): Get rid of this when we get the mac to behave.
-  // Even though we have set the SO_REUSEADDR the mac is not
-  // happy and gives us address alread in use errors.
-  try {
-    _httpServer.listen(host, port);
-    completer.complete(true);
-  } catch (e) {
-    if (_retries-- == 0) {
-      completer.completeException(e);
-    }
-    new Timer(1000, (t) {
-      startHttpServer(host, port).then((r) => completer.complete(r));
-    });
-  }
-  return completer.future;
+  _httpServer.listen(host, port);
 }
 
 terminateHttpServer() {
   _httpServer.close();
 }