Enforce LF line endings in the git database.

tests/compiler/dart2js/mirrors/library_exports_hidden_test.dart

 // Copyright (c) 2014, 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.
 
 import "dart:mirrors";
 
 import "package:async_helper/async_helper.dart";
 
 import "mirrors_test_helper.dart";
 import "../../../lib/mirrors/library_exports_hidden_test.dart";
 
 main() {
   asyncTest(() => analyze("library_exports_hidden_test.dart").
       then((MirrorSystem mirrors) {
     test(mirrors);
   }));
 }