Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/reflect-construct.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-reflect
-
 
 (function testReflectConstructArity() {
   assertEquals(2, Reflect.construct.length);
 })();
 
 
 (function testReflectConstructNonConstructor() {
   assertThrows(function() {
     new Reflect.construct(function(){}, []);
   }, TypeError);
@@ skipping 352 matching lines @@
       for (var realm of [realm1, realm2]) {
         test(realm, getname(intrinsic), getargs(intrinsic), convert);
       }
     }
   }
 
   test_all(test_intrinsic_default, (v)=>v);
   test_all(test_intrinsic_default,
            (v)=>{ "use strict"; return class extends v {}});
 })();