Remove harmony-strings flag.

test/mjsunit/es6/string-includes.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --harmony-strings
-
 assertEquals(1, String.prototype.includes.length);
 
 var reString = "asdf[a-z]+(asdf)?";
 assertTrue(reString.includes("[a-z]+"));
 assertTrue(reString.includes("(asdf)?"));
 
 // Random greek letters
 var twoByteString = "\u039a\u0391\u03a3\u03a3\u0395";
 
 // Test single char pattern
@@ skipping 117 matching lines @@
 
 assertThrows("String.prototype.includes.call({ 'toString': function() { " +
   "throw RangeError(); } }, /./)", RangeError);
 assertThrows("String.prototype.includes.call({ 'toString': function() { " +
   "return 'abc'; } }, /./)", TypeError);
 
 assertThrows("String.prototype.includes.apply({ 'toString': function() { " +
   "throw RangeError(); } }, [/./])", RangeError);
 assertThrows("String.prototype.includes.apply({ 'toString': function() { " +
   "return 'abc'; } }, [/./])", TypeError);