[es6] Remove harmony-classes flag

test/mjsunit/harmony/regress/regress-455141.js

Index: test/mjsunit/harmony/regress/regress-455141.js
diff --git a/test/mjsunit/harmony/regress/regress-455141.js b/test/mjsunit/harmony/regress/regress-455141.js
deleted file mode 100644
index cf2141f903839222e1065fe49cdaabdd47b1e64d..0000000000000000000000000000000000000000
--- a/test/mjsunit/harmony/regress/regress-455141.js
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2015 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-// Flags: --harmony-classes --no-lazy
-"use strict";
-class Base {
-}
-class Subclass extends Base {
-  constructor() {
-      this.prp1 = 3;
-  }
-}
-function __f_1(){
-}