Use constexpr TaskTraits constructor in extensions.

extensions/browser/updater/update_client_config.cc

 // Copyright 2015 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 "extensions/browser/updater/update_client_config.h"
 
 #include "base/task_scheduler/post_task.h"
 
 namespace extensions {
 
 UpdateClientConfig::UpdateClientConfig() {}
 
 scoped_refptr<base::SequencedTaskRunner>
 UpdateClientConfig::GetSequencedTaskRunner() const {
   return base::CreateSequencedTaskRunnerWithTraits(
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .WithShutdownBehavior(base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN));
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
 }
 
 UpdateClientConfig::~UpdateClientConfig() {}
 
 }  // namespace extensions