Remove runtime flags for Proxy and Reflect

test/mjsunit/harmony/proxies-cross-realm-exception.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
-
-// Do not read out the prototype from a cross-realm object.
-var realm = Realm.create();
-
-__proto__ = {};
-assertEquals(null,
-  Realm.eval(realm, "3; Reflect.getPrototypeOf(Realm.global(0))"));
-assertFalse(Realm.eval(realm, "3; Realm.global(0) instanceof Object"));
-
-__proto__ = new Proxy({}, { getPrototypeOf() { assertUnreachable() } });
-assertEquals(null,
-    Realm.eval(realm, "1; Reflect.getPrototypeOf(Realm.global(0))"));
-assertFalse(Realm.eval(realm, "1; Realm.global(0) instanceof Object"));
-
-// Test that the instannceof check works in optimized code.
-var test = Realm.eval(realm,
-    "()=>{1.1; return Realm.global(0) instanceof Object; }");
-assertFalse(test());
-test();
-test();
-%OptimizeFunctionOnNextCall(test);
-assertFalse(test());
-
-__proto__ = {};
-__proto__ = new Proxy({}, { get(t, p, r) { assertUnreachable() } });
-assertEquals(null,
-    Realm.eval(realm, "2; Reflect.getPrototypeOf(Realm.global(0))"));
-assertFalse(Realm.eval(realm, "2; Realm.global(0) instanceof Object"));
-
-
-__proto__ = {};
-__proto__.__proto__ = new Proxy({}, {
-  getPrototypeOf() { assertUnreachable() }
-});
-assertEquals(null,
-  Realm.eval(realm, "4; Reflect.getPrototypeOf(Realm.global(0))"));
-assertFalse(Realm.eval(realm, "4; Realm.global(0) instanceof Object"));
-
-// 2-level proxy indirection
-__proto__ = {};
-__proto__ = new Proxy({},
-  new Proxy({}, {
-    get() { assertUnreachable() }
-  })
-);
-assertEquals(null,
-  Realm.eval(realm, "5; Reflect.getPrototypeOf(Realm.global(0))"));
-assertFalse(Realm.eval(realm, "5; Realm.global(0) instanceof Object"));