Remove harmony-strings flag.

test/mjsunit/es6/string-repeat.js

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-// Flags: --harmony-strings
-
 assertEquals("000", String.prototype.repeat.call(0, 3));
 assertEquals("-1-1-1", String.prototype.repeat.call(-1, 3));
 assertEquals("2.12.12.1", String.prototype.repeat.call(2.1, 3));
 assertEquals("", String.prototype.repeat.call([], 3));
 assertEquals("1,2,3", String.prototype.repeat.call([1, 2, 3], 1));
 assertEquals("true", String.prototype.repeat.call(true, 1));
 assertEquals("false", String.prototype.repeat.call(false, 1));
 assertEquals("[object Object]", String.prototype.repeat.call({}, 1));
 
 assertEquals("000", String.prototype.repeat.apply(0, [3]));
@@ skipping 28 matching lines @@
 assertThrows('"a".repeat(Math.pow(2, 40))', RangeError);
 
 var myobj = {
   toString: function() {
     return "abc";
   },
   repeat : String.prototype.repeat
 };
 assertEquals("abc", myobj.repeat(1));
 assertEquals("abcabc", myobj.repeat(2));