[es6] Remove harmony-classes flag

test/mjsunit/harmony/object-literals-super.js

 // Copyright 2014 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 --harmony-arrow-functions --allow-natives-syntax
+// Flags: --harmony-arrow-functions --allow-natives-syntax
 
 
 (function TestHomeObject() {
   var object = {
     method() {
       return super.method();
     },
     get getter() {
       return super.getter;
     },
@@ skipping 157 matching lines @@
   var o = {
     __proto__: p,
     arrow() {
       assertSame(super.x, (() => super.x)());
       assertSame(super.m(), (() => super.m())());
       return (() => super.m())();
     }
   };
   assertSame(1, o.arrow());
 })();