Use constexpr TaskTraits constructor in chrome.

chrome/browser/win/enumerate_modules_model.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/win/enumerate_modules_model.h"
 
 #include <softpub.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <tlhelp32.h>
@@ skipping 149 matching lines @@
     module->version = module->version.substr(0, first_space);
 
   // The signer may be returned with trailing nulls.
   size_t first_null = module->cert_info.subject.find(L'\0');
   if (first_null != base::string16::npos)
     module->cert_info.subject.resize(first_null);
 }
 
 ModuleEnumerator::ModuleEnumerator(EnumerateModulesModel* observer)
     : background_task_runner_(base::CreateTaskRunnerWithTraits(
-          base::TaskTraits()
-              .MayBlock()
-              .WithPriority(base::TaskPriority::BACKGROUND)
-              .WithShutdownBehavior(
-                  base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN))),
+          {base::MayBlock(), base::TaskPriority::BACKGROUND,
+           base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})),
       enumerated_modules_(nullptr),
       observer_(observer),
       per_module_delay_(kDefaultPerModuleDelay) {}
 
 ModuleEnumerator::~ModuleEnumerator() {
 }
 
 void ModuleEnumerator::ScanNow(ModulesVector* list) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   enumerated_modules_ = list;
@@ skipping 536 matching lines @@
 
   UMA_HISTOGRAM_COUNTS_100("Conflicts.SuspectedBadModules",
                            suspected_bad_modules_detected_);
   UMA_HISTOGRAM_COUNTS_100("Conflicts.ConfirmedBadModules",
                            confirmed_bad_modules_detected_);
 
   // Forward the callback to any registered observers.
   for (Observer& observer : observers_)
     observer.OnScanCompleted();
 }