Remove runtime flags for sloppy mode block scoping features

test/mjsunit/regress/regress-crbug-451770.js

Index: test/mjsunit/regress/regress-crbug-451770.js
diff --git a/test/mjsunit/regress/regress-crbug-451770.js b/test/mjsunit/regress/regress-crbug-451770.js
index 770c8073cf53e8596a3cbb973abc42a9f7019367..b4f088d00e5878881a2875acaf711b5804e31ad1 100644
--- a/test/mjsunit/regress/regress-crbug-451770.js
+++ b/test/mjsunit/regress/regress-crbug-451770.js
@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --harmony-sloppy
-
 assertThrows(function f() {
   var t = { toString: function() { throw new Error(); } };
   var o = { [t]: 23 };