Remove all harmony runtime flags which shipped in M51

test/mjsunit/es6/unicode-regexp-restricted-syntax.js

Index: test/mjsunit/es6/unicode-regexp-restricted-syntax.js
diff --git a/test/mjsunit/harmony/unicode-regexp-restricted-syntax.js b/test/mjsunit/es6/unicode-regexp-restricted-syntax.js
similarity index 98%
rename from test/mjsunit/harmony/unicode-regexp-restricted-syntax.js
rename to test/mjsunit/es6/unicode-regexp-restricted-syntax.js
index d129cc340eb5c7ca32bcbd34da5500938650172f..dd4fa39ab5d3f1bec5e47d3440ca378a9f0cb67e 100644
--- a/test/mjsunit/harmony/unicode-regexp-restricted-syntax.js
+++ b/test/mjsunit/es6/unicode-regexp-restricted-syntax.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-unicode-regexps
-
 // test262/data/test/language/literals/regexp/u-dec-esc
 assertThrows("/\\1/u", SyntaxError);
 // test262/language/literals/regexp/u-invalid-char-range-a