Remove runtime flags for Proxy and Reflect

test/mjsunit/harmony/regress/regress-576662.js

Index: test/mjsunit/harmony/regress/regress-576662.js
diff --git a/test/mjsunit/harmony/regress/regress-576662.js b/test/mjsunit/harmony/regress/regress-576662.js
deleted file mode 100644
index 5541b79b5d1b538f5ae62a0530c30fd845bfe462..0000000000000000000000000000000000000000
--- a/test/mjsunit/harmony/regress/regress-576662.js
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright 2016 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
-
-// https://code.google.com/p/chromium/issues/detail?id=576662 (simplified)
-
-Realm.create();
-this.__proto__ = new Proxy({},{});
-assertThrows(() => Realm.eval(1, "Realm.global(0).bla = 1"));