[es6] Map/Set size getter should have "get size" name

src/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() {
@@ skipping 62 matching lines @@
 
 // -------------------------------------------------------------------
 
 %SetCode(SetIterator, SetIteratorConstructor);
 %FunctionSetPrototype(SetIterator, new GlobalObject());
 %FunctionSetInstanceClassName(SetIterator, 'Set Iterator');
 InstallFunctions(SetIterator.prototype, DONT_ENUM, [
   'next', SetIteratorNextJS
 ]);
 
-%FunctionSetName(SetIteratorSymbolIterator, '[Symbol.iterator]');
+SetFunctionName(SetIteratorSymbolIterator, symbolIterator);
 %AddNamedProperty(SetIterator.prototype, symbolIterator,
     SetIteratorSymbolIterator, DONT_ENUM);
 %AddNamedProperty(SetIterator.prototype, symbolToStringTag,
     "Set Iterator", READ_ONLY | DONT_ENUM);
 
 InstallFunctions(GlobalSet.prototype, DONT_ENUM, [
   'entries', SetEntries,
   'keys', SetValues,
   'values', SetValues
 ]);
@@ skipping 69 matching lines @@
 
 // -------------------------------------------------------------------
 
 %SetCode(MapIterator, MapIteratorConstructor);
 %FunctionSetPrototype(MapIterator, new GlobalObject());
 %FunctionSetInstanceClassName(MapIterator, 'Map Iterator');
 InstallFunctions(MapIterator.prototype, DONT_ENUM, [
   'next', MapIteratorNextJS
 ]);
 
-%FunctionSetName(MapIteratorSymbolIterator, '[Symbol.iterator]');
+SetFunctionName(MapIteratorSymbolIterator, symbolIterator);
 %AddNamedProperty(MapIterator.prototype, symbolIterator,
     MapIteratorSymbolIterator, DONT_ENUM);
 %AddNamedProperty(MapIterator.prototype, symbolToStringTag,
     "Map Iterator", READ_ONLY | DONT_ENUM);
 
 
 InstallFunctions(GlobalMap.prototype, DONT_ENUM, [
   'entries', MapEntries,
   'keys', MapKeys,
   'values', MapValues
 ]);
 
 %AddNamedProperty(GlobalMap.prototype, symbolIterator, MapEntries, DONT_ENUM);
 
 $mapEntries = MapEntries;
 $mapIteratorNext = MapIteratorNextJS;
 
 })();