[debug-wrappers] remove mirror tests.

test/mjsunit/regress/regress-crbug-629996.js

Index: test/mjsunit/regress/regress-crbug-629996.js
diff --git a/test/mjsunit/regress/regress-crbug-629996.js b/test/mjsunit/regress/regress-crbug-629996.js
deleted file mode 100644
index 025a86ee72ed2bc576c9acdd409bb4bae08a08dc..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-crbug-629996.js
+++ /dev/null
@@ -1,9 +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: --expose-debug-as debug
-
-var mirror = debug.MakeMirror(new Proxy({}, {}));
-// As long as we have no special mirror for proxies, we use an object mirror.
-assertEquals("object", mirror.type());