Remove a regression test that depended on utils.ImportNow()

src/js/prologue.js

 // Copyright 2015 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 151 matching lines @@
   %CheckIsBootstrapping();
 
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
     imports(exports_container);
   }
 
   // Whitelist of exports from normal natives to experimental natives and debug.
   var expose_list = [
     "FormatDateToParts",
     "MapEntries",
-    "MapIterator",
     "MapIteratorNext",
     "MaxSimple",
     "MinSimple",
-    "SetIterator",
     "SetIteratorNext",
     "SetValues",
     "ToLocaleLowerCaseI18N",
     "ToLocaleUpperCaseI18N",
     "ToLowerCaseI18N",
     "ToUpperCaseI18N",
     // From runtime:
     "promise_result_symbol",
     "promise_state_symbol",
     "reflect_apply",
@@ skipping 124 matching lines @@
   %promise_internal_reject(promise, reason, true);
 }
 
 extrasUtils.markPromiseAsHandled = function markPromiseAsHandled(promise) {
   %PromiseMarkAsHandled(promise);
 };
 
 %ToFastProperties(extrasUtils);
 
 })