Clean up native context slots and add new ones.

src/promise.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 $promiseHasUserDefinedRejectHandler;
 var $promiseStatus;
 var $promiseValue;
 
 (function(global, utils) {
 
@@ skipping 362 matching lines @@
   "race", PromiseRace,
   "resolve", PromiseCast
 ]);
 
 utils.InstallFunctions(GlobalPromise.prototype, DONT_ENUM, [
   "chain", PromiseChain,
   "then", PromiseThen,
   "catch", PromiseCatch
 ]);
 
-$promiseHasUserDefinedRejectHandler = PromiseHasUserDefinedRejectHandler;
 $promiseStatus = promiseStatus;
 $promiseValue = promiseValue;
 
 utils.ExportToRuntime(function(to) {
   to.promiseStatus = promiseStatus;
   to.promiseValue = promiseValue;
   to.PromiseCreate = PromiseCreate;
   to.PromiseResolve = PromiseResolve;
   to.PromiseReject = PromiseReject;
   to.PromiseChain = PromiseChain;
   to.PromiseCatch = PromiseCatch;
   to.PromiseThen = PromiseThen;
+  to.PromiseHasUserDefinedRejectHandler = PromiseHasUserDefinedRejectHandler;
 });
 
 })