Format all tests.

tests/language/source_self_negative_test.dart

 // 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.
 
 // Dart test program importing the core library explicitly.
 
 library SourceSelfNegativeTest;
-part "source_self_negative_test.dart";  // recursive reference to self.
+
+part "source_self_negative_test.dart"; // recursive reference to self.
 
 main() {
   print('should not be able to recursively include self as library part');
 }