Consistently say 'own' property

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.
 
 "use strict";
 
 // This file relies on the fact that the following declaration has been made
 // in runtime.js:
 // var $Object = global.Object
 // var $WeakMap = global.WeakMap
@@ skipping 22 matching lines @@
 // Core functionality.
 
 // Status values: 0 = pending, +1 = resolved, -1 = rejected
 var promiseStatus = GLOBAL_PRIVATE("Promise#status");
 var promiseValue = GLOBAL_PRIVATE("Promise#value");
 var promiseOnResolve = GLOBAL_PRIVATE("Promise#onResolve");
 var promiseOnReject = GLOBAL_PRIVATE("Promise#onReject");
 var promiseRaw = GLOBAL_PRIVATE("Promise#raw");
 
 function IsPromise(x) {
-  return IS_SPEC_OBJECT(x) && %HasLocalProperty(x, promiseStatus);
+  return IS_SPEC_OBJECT(x) && HAS_PRIVATE(x, promiseStatus);
 }
 
 function PromiseSet(promise, status, value, onResolve, onReject) {
   SET_PRIVATE(promise, promiseStatus, status);
   SET_PRIVATE(promise, promiseValue, value);
   SET_PRIVATE(promise, promiseOnResolve, onResolve);
   SET_PRIVATE(promise, promiseOnReject, onReject);
   return promise;
 }
 
@@ skipping 240 matching lines @@
     "resolve", PromiseCast
   ]);
   InstallFunctions($Promise.prototype, DONT_ENUM, [
     "chain", PromiseChain,
     "then", PromiseThen,
     "catch", PromiseCatch
   ]);
 }
 
 SetUpPromise();