Remove runtime flags for Proxy and Reflect

test/mjsunit/harmony/proxies-global-reference.js

Index: test/mjsunit/harmony/proxies-global-reference.js
diff --git a/test/mjsunit/harmony/proxies-global-reference.js b/test/mjsunit/harmony/proxies-global-reference.js
deleted file mode 100644
index 1b77e66fdf3eb8822a426bd8d7f1482ef31a287c..0000000000000000000000000000000000000000
--- a/test/mjsunit/harmony/proxies-global-reference.js
+++ /dev/null
@@ -1,14 +0,0 @@
-// 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
-
-var failing_proxy = new Proxy({}, new Proxy({}, {
-  get() { throw "No trap should fire" }}));
-
-Object.setPrototypeOf(Object.prototype, failing_proxy);
-assertThrows(()=>a, TypeError);
-
-Object.setPrototypeOf(this, failing_proxy);
-assertThrows(()=>a, TypeError);