Revert "Fix closure conversion in field and local initializers."

pkg/kernel/testcases/closures_initializers/local_initializers.dart

-// Copyright (c) 2017, 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.
-
-// The purpose of this test is to detect that closures in [LocalInitializer]s
-// are properly converted.  This test assumes that
-// [ArgumentExtractionForRedirecting] transformer was run before closure
-// conversion.  It should introduce one [LocalInitializer] for each argument
-// passed to the redirecting constructor.  If such argument contains a closure,
-// it would appear in a [LocalInitializer].
-
-class X {}
-
-class A {
-  X foo;
-  A.named(X foo) {}
-  A(X foo) : this.named((() => foo)());
-}
-
-main() {
-  A a = new A(new X());
-  a.foo; // To prevent dartanalyzer from marking [a] as unused.
-}