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

tests/standalone/io/http_client_test.dart

Index: tests/standalone/io/http_client_test.dart
diff --git a/tests/standalone/io/http_client_test.dart b/tests/standalone/io/http_client_test.dart
index 1dd2b25cdc99fc0d1da288be9ed6de30f65b2aff..ca1daef76354e54d59db43c446c722b9cdd12fc3 100644
--- a/tests/standalone/io/http_client_test.dart
+++ b/tests/standalone/io/http_client_test.dart
@@ -2,9 +2,9 @@
 // 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");
-#import("dart:isolate");
+import "dart:io";
+import "dart:uri";
+import "dart:isolate";
 
 void testGoogle() {
   HttpClient client = new HttpClient();