[es6] Implement spec compliant ToName (actually ToPropertyKey).

src/debug/mirrors.js

 // Copyright 2006-2012 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.
 
 (function(global, utils) {
 "use strict";
 
 // ----------------------------------------------------------------------------
 // Imports
 
@@ skipping 843 matching lines @@
  * Return the internal properties for this object as an array of
  * InternalPropertyMirror objects.
  * @return {Array} Property mirrors for this object
  */
 ObjectMirror.prototype.internalProperties = function() {
   return ObjectMirror.GetInternalProperties(this.value_);
 }
 
 
 ObjectMirror.prototype.property = function(name) {
-  var details = %DebugGetPropertyDetails(this.value_, builtins.$toName(name));
+  var details = %DebugGetPropertyDetails(this.value_, TO_NAME(name));
   if (details) {
     return new PropertyMirror(this, name, details);
   }
 
   // Nothing found.
   return GetUndefinedMirror();
 };
 
 
 
@@ skipping 2234 matching lines @@
 // Functions needed by the debugger runtime.
 utils.InstallFunctions(utils, DONT_ENUM, [
   "ClearMirrorCache", ClearMirrorCache
 ]);
 
 // Export to debug.js
 utils.Export(function(to) {
   to.MirrorType = MirrorType;
 });
 })