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

tests/standalone/io/list_output_stream_test.dart

Index: tests/standalone/io/list_output_stream_test.dart
diff --git a/tests/standalone/io/list_output_stream_test.dart b/tests/standalone/io/list_output_stream_test.dart
index f8e33bb1028102f2c398829029cf074951bf295a..a9a5b258ae1002bffb1436289a563e96ea1faf5a 100644
--- a/tests/standalone/io/list_output_stream_test.dart
+++ b/tests/standalone/io/list_output_stream_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 testEmptyListOutputStream1() {
   ListOutputStream stream = new ListOutputStream();