Remove the now unnecessary flag from test files

tests/language/initializing_formal_type_test.dart

 // Copyright (c) 2016, 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.
-//
-// DartOptions=--initializing-formal-access
-// VMOptions=--initializing-formal-access
 
 import "package:expect/expect.dart";
 
 class A {
   num x;
   double y;
   // Finding the type of an initializing formal: should cause a warning
   // in the initializer but not the body, because the former has type
   // `int` and the latter has type `num`.
   A(int this.x) : y = x {
     y = x;
   }
 }
 
 main() {
   A a = new A(null);
   Expect.equals(a.x, null);
   Expect.equals(a.y, null);
 }