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

dart/tests/language/top_level_file1.dart

Index: dart/tests/language/top_level_file1.dart
diff --git a/dart/tests/language/top_level_file1.dart b/dart/tests/language/top_level_file1.dart
index f70521936d493c8d72cb47a24a41fb356e637905..160d3007ee4f8c815640c63933a49d2e11a50eb5 100644
--- a/dart/tests/language/top_level_file1.dart
+++ b/dart/tests/language/top_level_file1.dart
@@ -1,7 +1,6 @@
 // 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 TopLevelMultipleFilesTest;
 
 main() {
   Expect.equals(topLevelVar, 42);