Fix http test

tests/compiler/dart2js/quarantined/http_test.dart

Index: tests/compiler/dart2js/quarantined/http_test.dart
diff --git a/tests/compiler/dart2js/quarantined/http_test.dart b/tests/compiler/dart2js/quarantined/http_test.dart
index cdb1348ff9e45a69f94ae1dcde22268840dc1ac8..328cea36a7476eef0287783188333a811dde8e11 100644
--- a/tests/compiler/dart2js/quarantined/http_test.dart
+++ b/tests/compiler/dart2js/quarantined/http_test.dart
@@ -15,7 +15,9 @@ import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:path/path.dart' as path;
 
-Uri pathOfData = Platform.script.resolve('../http_launch_data/');
+import '../launch_helper.dart' show launchDart2Js;
+
+Uri pathOfData = Platform.script.resolve('http_launch_data/');
 Directory tempDir;
 String outFilePath;
 
@@ -39,14 +41,6 @@ Future handleRequest(HttpRequest request) {
   });
 }
 
-Future launchDart2Js(args) {
-  String ext = Platform.isWindows ? '.bat' : '';
-  String command =
-      path.normalize(path.join(path.fromUri(Platform.script),
-                    '../../../../../sdk/bin/dart2js${ext}'));
-  return Process.run(command, args);
-}
-
 void check(ProcessResult result) {
   Expect.equals(0, result.exitCode);
   File outFile = new File(outFilePath);