Native context: do not put public symbols and flags on the js builtins object.

src/harmony-array.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 'use strict';
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GetIterator;
 var GetMethod;
 var GlobalArray = global.Array;
-var GlobalSymbol = global.Symbol;
+var iteratorSymbol = utils.ImportNow("iterator_symbol");
 var MathMax;
 var MathMin;
 var ObjectIsFrozen;
 var ObjectDefineProperty;
 var ToNumber;
 
 utils.Import(function(from) {
   GetIterator = from.GetIterator;
   GetMethod = from.GetMethod;
   MathMax = from.MathMax;
@@ skipping 186 matching lines @@
       throw MakeTypeError(kCalledNonCallable, mapfn);
     } else if (%IsSloppyModeFunction(mapfn)) {
       if (IS_NULL(receiver)) {
         receiver = UNDEFINED;
       } else if (!IS_UNDEFINED(receiver)) {
         receiver = TO_OBJECT(receiver);
       }
     }
   }
 
-  var iterable = GetMethod(items, symbolIterator);
+  var iterable = GetMethod(items, iteratorSymbol);
   var k;
   var result;
   var mappedValue;
   var nextValue;
 
   if (!IS_UNDEFINED(iterable)) {
     result = %IsConstructor(this) ? new this() : [];
 
     var iterator = GetIterator(items, iterable);
 
@@ skipping 78 matching lines @@
 
 utils.Export(function(to) {
   to.ArrayFrom = ArrayFrom;
   to.InnerArrayCopyWithin = InnerArrayCopyWithin;
   to.InnerArrayFill = InnerArrayFill;
   to.InnerArrayFind = InnerArrayFind;
   to.InnerArrayFindIndex = InnerArrayFindIndex;
 });
 
 })