Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/proxies-get.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 --allow-natives-syntax
+// Flags: --allow-natives-syntax
 
 (function testBasicFunctionality() {
    var target = {
      target_one: 1,
      property: "value"
    };
 
    var handler = {handler:1};
 
    var proxy = new Proxy(target, handler);
@@ skipping 102 matching lines @@
   });
 
   assertThrows(function() {
     for (var v of it) log.push(v);
   }, TypeError);
   assertEquals([
     "[[Get]](iterator, Symbol(Symbol.iterator))",
     "[[Get]](iterator, next)"
   ], log);
 })();