Enforce LF line endings in the git database.

tests/compiler/dart2js/frontend_checker.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.
 
 // Checks that dart2js produces the expected static type warnings and
 // compile-time errors for the provided multitests.
 
 import 'dart:async';
 import 'dart:io';
 
@@ skipping 90 matching lines @@
 === ERROR: Unexpected result of analysis.
 ===
 === Please update the white-listing in $testFileName
 ===
 
 ''');
       exit(1);
     }
   }));
 }