Enforce LF line endings in the git database.

tests/compiler/dart2js/line_column_provider_test.dart

 // Copyright (c) 2015, 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.
 
 // Unittest for the [LineColumnCollector].
 
 import 'package:expect/expect.dart';
 import 'package:compiler/src/io/code_output.dart';
 import 'package:compiler/src/io/line_column_provider.dart';
 
@@ skipping 64 matching lines @@
   test(["a", buffer2], positions);
 
   CodeBuffer buffer3 = new CodeBuffer();
   buffer3.add("a");
   test([buffer3, buffer2], positions);
 
   CodeBuffer buffer4 = new CodeBuffer();
   buffer4.addBuffer(buffer3);
   test([buffer4, buffer2], positions);
 }