Revert "Parts must start with 'part of'" and "Attempt to fix VM build"

dart/tests/language/empty_main.dart

Index: dart/tests/language/empty_main.dart
diff --git a/dart/tests/language/empty_main.dart b/dart/tests/language/empty_main.dart
index d9e0bd5d6465267d7602fed72e08b5df726dbdfe..7def6efcafa2e62f42205d280b8ce0bbc2bc593b 100644
--- a/dart/tests/language/empty_main.dart
+++ b/dart/tests/language/empty_main.dart
@@ -1,6 +1,5 @@
 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // 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.
-part of ApplicationTest;
 
 main() {}