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

src/collection.js

 // Copyright 2012 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.
 
 var $getHash;
 var $getExistingHash;
 
 (function(global, utils) {
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalMap = global.Map;
 var GlobalObject = global.Object;
 var GlobalSet = global.Set;
-var hashCodeSymbol = utils.GetPrivateSymbol("hash_code_symbol");
+var hashCodeSymbol = utils.ImportNow("hash_code_symbol");
 var IntRandom;
+var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
   IntRandom = from.IntRandom;
 });
 
 var NumberIsNaN;
 
 utils.Import(function(from) {
   NumberIsNaN = from.NumberIsNaN;
 });
@@ skipping 232 matching lines @@
     %_CallFunction(new_receiver, key, key, this, f);
   }
 }
 
 // -------------------------------------------------------------------
 
 %SetCode(GlobalSet, SetConstructor);
 %FunctionSetLength(GlobalSet, 0);
 %FunctionSetPrototype(GlobalSet, new GlobalObject());
 %AddNamedProperty(GlobalSet.prototype, "constructor", GlobalSet, DONT_ENUM);
-%AddNamedProperty(GlobalSet.prototype, symbolToStringTag, "Set",
+%AddNamedProperty(GlobalSet.prototype, toStringTagSymbol, "Set",
                   DONT_ENUM | READ_ONLY);
 
 %FunctionSetLength(SetForEach, 1);
 
 // Set up the non-enumerable functions on the Set prototype object.
 utils.InstallGetter(GlobalSet.prototype, "size", SetGetSize);
 utils.InstallFunctions(GlobalSet.prototype, DONT_ENUM, [
   "add", SetAdd,
   "has", SetHas,
   "delete", SetDelete,
@@ skipping 169 matching lines @@
   }
 }
 
 // -------------------------------------------------------------------
 
 %SetCode(GlobalMap, MapConstructor);
 %FunctionSetLength(GlobalMap, 0);
 %FunctionSetPrototype(GlobalMap, new GlobalObject());
 %AddNamedProperty(GlobalMap.prototype, "constructor", GlobalMap, DONT_ENUM);
 %AddNamedProperty(
-    GlobalMap.prototype, symbolToStringTag, "Map", DONT_ENUM | READ_ONLY);
+    GlobalMap.prototype, toStringTagSymbol, "Map", DONT_ENUM | READ_ONLY);
 
 %FunctionSetLength(MapForEach, 1);
 
 // Set up the non-enumerable functions on the Map prototype object.
 utils.InstallGetter(GlobalMap.prototype, "size", MapGetSize);
 utils.InstallFunctions(GlobalMap.prototype, DONT_ENUM, [
   "get", MapGet,
   "set", MapSet,
   "has", MapHas,
   "delete", MapDelete,
@@ skipping 34 matching lines @@
   "map_has", MapHas,
   "map_delete", MapDelete,
   "set_add", SetAdd,
   "set_has", SetHas,
   "set_delete", SetDelete,
   "map_from_array", MapFromArray,
   "set_from_array",SetFromArray,
 ]);
 
 })