Revert "New tests for initializing formal access."

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
-
-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);
-}