Enable ES6 iteration by default

test/mjsunit/es6/array-iterator.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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 //       notice, this list of conditions and the following disclaimer.
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-// Flags: --harmony-iteration --allow-natives-syntax
+// Flags: --allow-natives-syntax
 
 
 var NONE = 0;
 var READ_ONLY = 1;
 var DONT_ENUM = 2;
 var DONT_DELETE = 4;
 
 
 function assertHasOwnProperty(object, name, attrs) {
   assertTrue(object.hasOwnProperty(name));
@@ skipping 204 matching lines @@
 function TestNonOwnSlots() {
   var array = [0];
   var iterator = array.values();
   var object = {__proto__: iterator};
 
   assertThrows(function() {
     object.next();
   }, TypeError);
 }
 TestNonOwnSlots();