Remove support for Object.observe

test/mjsunit/regress/regress-observe-map-cache.js

Index: test/mjsunit/regress/regress-observe-map-cache.js
diff --git a/test/mjsunit/regress/regress-observe-map-cache.js b/test/mjsunit/regress/regress-observe-map-cache.js
deleted file mode 100644
index c71759c0cc04d2430b247c65d641b17b62f590f4..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-observe-map-cache.js
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2014 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-object-observe
-// Flags: --allow-natives-syntax --enable-slow-asserts
-
-function f() {
-  var x = new Array(0);
-  x[-1] = -1;
-  Object.observe(x, function() { });
-}
-
-f();
-f();