Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/instanceof-proxies.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 --allow-natives-syntax
+// Flags: --allow-natives-syntax
 
 // Test instanceof with proxies.
 
 (function TestInstanceOfWithProxies() {
   function foo(x) {
     return x instanceof Array;
   }
   assertTrue(foo([]));
   assertFalse(foo({}));
   %OptimizeFunctionOnNextCall(foo);
@@ skipping 36 matching lines @@
 (function testInstanceOfWithRecursiveProxy() {
   // Make sure we gracefully deal with recursive proxies.
   var proxy = new Proxy({},{});
   proxy.__proto__ = proxy;
   // instanceof will cause an inifinite prototype walk.
   assertThrows(() => { proxy instanceof Object }, RangeError);
 
   var proxy2 = new Proxy({}, {getPrototypeOf() { return proxy2 }});
   assertThrows(() => { proxy instanceof Object }, RangeError);
 })();