Remove stale references to --harmony-arrays flag in mjsunit tests

test/mjsunit/es6/array-find.js

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-// Flags: --harmony-arrays
-
 assertEquals(1, Array.prototype.find.length);
 
 var a = [21, 22, 23, 24];
 assertEquals(undefined, a.find(function() { return false; }));
 assertEquals(21, a.find(function() { return true; }));
 assertEquals(undefined, a.find(function(val) { return 121 === val; }));
 assertEquals(24, a.find(function(val) { return 24 === val; }));
 assertEquals(23, a.find(function(val) { return 23 === val; }), null);
 assertEquals(22, a.find(function(val) { return 22 === val; }), undefined);
 
@@ skipping 269 matching lines @@
 
 assertThrows('Array.prototype.find.apply({}, null, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, undefined, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, 0, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, true, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, false, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, "", [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, {}, [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, [], [])', TypeError);
 assertThrows('Array.prototype.find.apply({}, /\d+/, [])', TypeError);