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

tests/standalone/io/http_auth_test.dart

Index: tests/standalone/io/http_auth_test.dart
diff --git a/tests/standalone/io/http_auth_test.dart b/tests/standalone/io/http_auth_test.dart
index 07705de26b91c426cd4c7ef73d21ba0cf8894cda..7272658f059638da4ec10ea44ecbd8a2ef415953 100644
--- a/tests/standalone/io/http_auth_test.dart
+++ b/tests/standalone/io/http_auth_test.dart
@@ -2,11 +2,11 @@
 // 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:isolate");
-#import("dart:crypto");
-#import("dart:io");
-#import("dart:uri");
-#import("dart:utf");
+import "dart:isolate";
+import "dart:crypto";
+import "dart:io";
+import "dart:uri";
+import "dart:utf";
 
 class Server {
   HttpServer server;