Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/proxies-bind.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
-
 // Tests the interaction of Function.prototype.bind with proxies.
 
 
 // (Helper)
 
 var log = [];
 var logger = {};
 var handler = new Proxy({}, logger);
 
 logger.get = function(t, trap, r) {
@@ skipping 111 matching lines @@
 
 assertThrows(() => Function.prototype.bind.call(new Proxy({}, {})), TypeError);
 assertThrows(() => Function.prototype.bind.call(new Proxy([], {})), TypeError);
 
 
 // Non-constructable
 
 result = Function.prototype.bind.call(() => 42, this_value, "foo");
 assertEquals(42, result());
 assertThrows(() => new result());