Remove the now unnecessary flag from test files

tests/language/initializing_formal_final_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 {
   var x, y;
   // This should cause a warning because `x` is final when
   // accessed as an initializing formal.
   A(this.x) : y = (() { x = 3; });
 }
 
 main() {
   A a = new A(2);
   Expect.equals(a.x, 2);
   Expect.throws(() => a.y(), (e) => e is NoSuchMethodError);
 }