Change line endings from Windows to Unix

tests/language/field_decl_missing_var_type_test.dart

 // Copyright (c) 2012, 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 for constructors and initializers.
 
 // Exercises issue 2997, missing var or type on field declarations should
 // generate a compile-time error.
 
 class A {
   _this;                      /// 01: compile-time error
   A(x) : this._this = x;      /// 01: continued
 }
 main() {
   new A(0);                   /// 01: continued
 }