Format samples and samples-dev directories.

samples/build_dart/test/build_dart_test.dart

 // Copyright (c) 2013, 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.
 
 library build_dart_test;
 
 import '../build.dart' as build_dart;
 import '../bin/test.dart' as test2;
 
 /**
  * This test exists to ensure that the build_dart sample compiles without
  * errors.
  */
-void main() {
-
-}
+void main() {}