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

dart/pkg/unittest/test/matchers_test.dart

Index: dart/pkg/unittest/test/matchers_test.dart
diff --git a/dart/pkg/unittest/test/matchers_test.dart b/dart/pkg/unittest/test/matchers_test.dart
index 7c357fc165506f7bf57bd780cd473b47b8176f2f..11bdcc2261d4f2dea1b7706e333e06f7aa612daf 100644
--- a/dart/pkg/unittest/test/matchers_test.dart
+++ b/dart/pkg/unittest/test/matchers_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.
 
-library matcherTest;
-import '../../../pkg/unittest/unittest.dart';
-part 'test_utils.dart';
+#library('matcherTest');
+#import('../../../pkg/unittest/unittest.dart');
+#source('test_utils.dart');
 
 doesNotThrow() {}
 doesThrow() { throw 'X'; }