Remove all harmony runtime flags which shipped in M51

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

-// Copyright 2016 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-unicode-regexps
-
-// test262/data/test/language/literals/regexp/u-dec-esc
-assertThrows("/\\1/u", SyntaxError);
-// test262/language/literals/regexp/u-invalid-char-range-a
-assertThrows("/[\\w-a]/u", SyntaxError);
-// test262/language/literals/regexp/u-invalid-char-range-b
-assertThrows("/[a-\\w]/u", SyntaxError);
-// test262/language/literals/regexp/u-invalid-char-esc
-assertThrows("/\\c/u", SyntaxError);
-assertThrows("/\\c0/u", SyntaxError);
-// test262/built-ins/RegExp/unicode_restricted_quantifiable_assertion
-assertThrows("/(?=.)*/u", SyntaxError);
-// test262/built-ins/RegExp/unicode_restricted_octal_escape
-assertThrows("/[\\1]/u", SyntaxError);
-assertThrows("/\\00/u", SyntaxError);
-assertThrows("/\\09/u", SyntaxError);
-// test262/built-ins/RegExp/unicode_restricted_identity_escape_alpha
-assertThrows("/[\\c]/u", SyntaxError);
-// test262/built-ins/RegExp/unicode_restricted_identity_escape_c
-assertThrows("/[\\c0]/u", SyntaxError);
-// test262/built-ins/RegExp/unicode_restricted_incomple_quantifier
-assertThrows("/a{/u", SyntaxError);
-assertThrows("/a{1,/u", SyntaxError);
-assertThrows("/{/u", SyntaxError);
-assertThrows("/}/u", SyntaxError);
-// test262/data/test/built-ins/RegExp/unicode_restricted_brackets
-assertThrows("/]/u", SyntaxError);
-// test262/built-ins/RegExp/unicode_identity_escape
-/\//u;
-
-// escaped \0 is allowed inside a character class.
-assertEquals(["\0"], /[\0]/u.exec("\0"));
-// unless it is followed by another digit.
-assertThrows("/[\\00]/u", SyntaxError);
-assertThrows("/[\\01]/u", SyntaxError);
-assertThrows("/[\\09]/u", SyntaxError);
-assertEquals(["\u{0}1\u{0}a\u{0}"], /[1\0a]+/u.exec("b\u{0}1\u{0}a\u{0}2"));
-// escaped \- is allowed inside a character class.
-assertEquals(["-"], /[a\-z]/u.exec("12-34"));