Remove runtime flags for Proxy and Reflect

test/mjsunit/es6/proxies-set.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 sloppyDefaultSet(o, p, v) { return o[p] = v }
 function sloppyReflectSet(o, p, v) { return Reflect.set(o, p, v) }
 function strictDefaultSet(o, p, v) { "use strict"; return o[p] = v }
 function strictReflectSet(o, p, v) { "use strict"; return Reflect.set(o, p, v) }
 
 sloppyDefaultSet.shouldThrow = false;
 sloppyReflectSet.shouldThrow = false;
 strictDefaultSet.shouldThrow = true;
 strictReflectSet.shouldThrow = false;
@@ skipping 286 matching lines @@
     for (var receiver of [null, undefined, 1]) {
       Reflect.set(object, p, 42, receiver);
       assertEquals(1, observations.length);
       assertArrayEquals([target, toKey(p), 42, receiver], observations[0]);
       assertSame(target, observations[0][0]);
       assertSame(receiver, observations[0][3]);
       observations = [];
     }
   }
 })();