[promises] Remove unneeded PromiseCreate function from promise.js

src/js/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.
 
 (function(global, utils, extrasUtils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 13 matching lines @@
 
 function PromiseIdResolveHandler(x) { return x; }
 function PromiseIdRejectHandler(r) { %_ReThrow(r); }
 SET_PRIVATE(PromiseIdRejectHandler, promiseForwardingHandlerSymbol, true);
 
 // -------------------------------------------------------------------
 // Define exported functions.
 
 // For bootstrapper.
 
-// This is used by utils and v8-extras.
-function PromiseCreate(parent) {
-  return %promise_internal_constructor(parent);
-}
-
 // Export to bindings
 function DoRejectPromise(promise, reason) {
   %PromiseReject(promise, reason, true);
 }
 
 // Combinators.
 
 // ES#sec-promise.all
 // Promise.all ( iterable )
 function PromiseAll(iterable) {
@@ skipping 98 matching lines @@
 
 // -------------------------------------------------------------------
 // Install exported functions.
 
 utils.InstallFunctions(GlobalPromise, DONT_ENUM, [
   "all", PromiseAll,
   "race", PromiseRace,
 ]);
 
 %InstallToContext([
-  "promise_create", PromiseCreate,
   "promise_reject", DoRejectPromise,
   "promise_id_resolve_handler", PromiseIdResolveHandler,
   "promise_id_reject_handler", PromiseIdRejectHandler
 ]);
 
 // This allows extras to create promises quickly without building extra
 // resolve/reject closures, and allows them to later resolve and reject any
 // promise without having to hold on to those closures forever.
 utils.InstallFunctions(extrasUtils, 0, [
-  "createPromise", PromiseCreate,
   "rejectPromise", DoRejectPromise,
   "markPromiseAsHandled", MarkPromiseAsHandled
 ]);
 
 })