Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/new-target.js

 // 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-reflect
-
 
 (function TestClass() {
   'use strict';
 
   var calls = 0;
   class Base {
     constructor(_) {
       assertEquals(Base, new.target);
       calls++;
     }
@@ skipping 388 matching lines @@
 (function TestEarlyErrors() {
   assertThrows(function() { Function("new.target = 42"); }, ReferenceError);
   assertThrows(function() { Function("var foo = 1; new.target = foo = 42"); }, ReferenceError);
   assertThrows(function() { Function("var foo = 1; foo = new.target = 42"); }, ReferenceError);
   assertThrows(function() { Function("new.target--"); }, ReferenceError);
   assertThrows(function() { Function("--new.target"); }, ReferenceError);
   assertThrows(function() { Function("(new.target)++"); }, ReferenceError);
   assertThrows(function() { Function("++(new.target)"); }, ReferenceError);
   assertThrows(function() { Function("for (new.target of {});"); }, SyntaxError);
 })();