[es6] Implement Reflect.enumerate.

test/mjsunit/harmony/reflect-enumerate-delete.js

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2010-2015 the V8 project authors. All rights reserved.
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-// Test that properties deleted during a for-in iteration do not show up in
-// the for-in.
+// Test that properties deleted during an enumeration do not show up in
+// the enumeration.  This is adapted from mjsunit/for-in-delete.js.
+
+// Flags: --harmony-reflect
+
 
 function f(o, expected, del) {
   var index = 0;
-  for (p in o) {
+  for (p of Reflect.enumerate(o)) {
     if (del) delete o[del];
     assertEquals(expected[index], p);
     index++;
   }
   assertEquals(expected.length, index);
 }
 
 var o = {}
 o.a = 1;
 o.b = 2;
 o.c = 3;
 o.d = 3;
 
 f(o, ['a', 'b', 'c', 'd']);
 f(o, ['a', 'b', 'c', 'd']);
 f(o, ['a', 'c', 'd'], 'b');
 f(o, ['a', 'c'], 'd');