[promises] cleanup default promise handlers

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();
 
 // -------------------------------------------------------------------
 // Imports
 
 var InternalArray = utils.InternalArray;
 var promiseHandledBySymbol =
     utils.ImportNow("promise_handled_by_symbol");
 var promiseForwardingHandlerSymbol =
     utils.ImportNow("promise_forwarding_handler_symbol");
 var GlobalPromise = global.Promise;
 
 // -------------------------------------------------------------------
-
-// Core functionality.
-
-function PromiseIdResolveHandler(x) { return x; }
-function PromiseIdRejectHandler(r) { %_ReThrow(r); }
-SET_PRIVATE(PromiseIdRejectHandler, promiseForwardingHandlerSymbol, true);
-
-// -------------------------------------------------------------------
 // Define exported functions.
 
 // Combinators.
 
 // ES#sec-promise.all
 // Promise.all ( iterable )
 function PromiseAll(iterable) {
   if (!IS_RECEIVER(this)) {
     throw %make_type_error(kCalledOnNonObject, "Promise.all");
   }
@@ skipping 90 matching lines @@
 }
 
 // -------------------------------------------------------------------
 // Install exported functions.
 
 utils.InstallFunctions(GlobalPromise, DONT_ENUM, [
   "all", PromiseAll,
   "race", PromiseRace,
 ]);
 
-%InstallToContext([
-  "promise_id_resolve_handler", PromiseIdResolveHandler,
-  "promise_id_reject_handler", PromiseIdRejectHandler
-]);
-
 })