Remove support for Object.observe

test/mjsunit/regress/regress-417709b.js

Index: test/mjsunit/regress/regress-417709b.js
diff --git a/test/mjsunit/regress/regress-417709b.js b/test/mjsunit/regress/regress-417709b.js
deleted file mode 100644
index 4d9572e7d79eaf486fef05942be3b701df943897..0000000000000000000000000000000000000000
--- a/test/mjsunit/regress/regress-417709b.js
+++ /dev/null
@@ -1,16 +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 --stack-size=100
-
-var a = [];
-
-Array.observe(a, function() {});
-
-function f(a, x) {
-  a.length = x;
-  f(a, x + 1);
-}
-
-assertThrows(function() { f(a, 1); }, RangeError);