Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/proxies-construct.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-proxies --harmony-reflect
-
 (function testNonConstructable() {
   var proxy = new Proxy({},{});
   assertThrows(function(){ new proxy() }, TypeError);
 
   var proxy2 = new Proxy(proxy, {});
   assertThrows(function(){ proxy2() }, TypeError);
 })();
 
 (function testFailingConstructRevoked() {
   var pair = Proxy.revocable(Array, {});
@@ skipping 132 matching lines @@
 
   var result3 = ReflectConstructRealm1(proxy, []);
   assertSame(Realm.eval(realm1, 'Array.prototype'),
     Reflect.getPrototypeOf(result3));
 
   var ReflectConstructRealm2 = Realm.eval(realm2, 'Reflect.construct');
   var result4 = ReflectConstructRealm2(proxy, argsRealm1);
   assertSame(Realm.eval(realm2, 'Array.prototype'),
     Reflect.getPrototypeOf(result4));
 })();