Use import/export for more functions (instead of js builtins object).

src/js/collection-iterator.js

 // Copyright 2014 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 $mapEntries;
-var $mapIteratorNext;
-var $setIteratorNext;
-var $setValues;
-
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 var GlobalMap = global.Map;
 var GlobalSet = global.Set;
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
@@ skipping 60 matching lines @@
     "Set Iterator", READ_ONLY | DONT_ENUM);
 
 utils.InstallFunctions(GlobalSet.prototype, DONT_ENUM, [
   'entries', SetEntries,
   'keys', SetValues,
   'values', SetValues
 ]);
 
 %AddNamedProperty(GlobalSet.prototype, iteratorSymbol, SetValues, DONT_ENUM);
 
-$setIteratorNext = SetIteratorNextJS;
-$setValues = SetValues;
-
 // -------------------------------------------------------------------
 
 function MapIteratorConstructor(map, kind) {
   %MapIteratorInitialize(this, map, kind);
 }
 
 
 function MapIteratorNextJS() {
   if (!IS_MAP_ITERATOR(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
@@ skipping 60 matching lines @@
 
 
 utils.InstallFunctions(GlobalMap.prototype, DONT_ENUM, [
   'entries', MapEntries,
   'keys', MapKeys,
   'values', MapValues
 ]);
 
 %AddNamedProperty(GlobalMap.prototype, iteratorSymbol, MapEntries, DONT_ENUM);
 
-$mapEntries = MapEntries;
-$mapIteratorNext = MapIteratorNextJS;
+// -------------------------------------------------------------------
+// Exports
+
+utils.Export(function(to) {
+  to.MapEntries = MapEntries;
+  to.MapIteratorNext = MapIteratorNextJS;
+  to.SetIteratorNext = SetIteratorNextJS;
+  to.SetValues = SetValues;
+});
 
 })