Remove old #import, #source, and #library syntax from tests/standalone.

tests/standalone/io/http_server_test.dart

Index: tests/standalone/io/http_server_test.dart
diff --git a/tests/standalone/io/http_server_test.dart b/tests/standalone/io/http_server_test.dart
index 7cda6f4599646a86cb9fc6d481ca6a749c5ba8de..8e7424e5349679676b2759509800fbdee2abaaae 100644
--- a/tests/standalone/io/http_server_test.dart
+++ b/tests/standalone/io/http_server_test.dart
@@ -2,8 +2,8 @@
 // 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:isolate");
+import "dart:io";
+import "dart:isolate";
 
 void testListenOn() {
   ServerSocket socket = new ServerSocket("127.0.0.1", 0, 5);