Remove all harmony runtime flags which shipped in M51

test/mjsunit/es6/instanceof.js

Index: test/mjsunit/es6/instanceof.js
diff --git a/test/mjsunit/harmony/instanceof-es6.js b/test/mjsunit/es6/instanceof.js
similarity index 98%
rename from test/mjsunit/harmony/instanceof-es6.js
rename to test/mjsunit/es6/instanceof.js
index 4971c9c76b782025373e2b0d7020cc217dabedb7..6bf225953f36ae38a665a109a7be2e35ec0f8479 100644
--- a/test/mjsunit/harmony/instanceof-es6.js
+++ b/test/mjsunit/es6/instanceof.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-instanceof
-
 // Make sure it's an error if @@hasInstance isn't a function.
 (function() {
   var F = {};