Use constexpr TaskTraits constructor in chromeos.

chromeos/cert_loader.cc

 // Copyright (c) 2013 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 "chromeos/cert_loader.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 189 matching lines @@
 }
 
 void CertLoader::CertificatesLoaded(
     std::unique_ptr<net::CertificateList> all_certs) {
   DCHECK(thread_checker_.CalledOnValidThread());
   VLOG(1) << "CertificatesLoaded: " << all_certs->size();
 
   crypto::ScopedPK11Slot system_slot = database_->GetSystemSlot();
   base::PostTaskWithTraitsAndReplyWithResult(
       FROM_HERE,
-      base::TaskTraits()
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-          .MayBlock(),
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::BindOnce(&FilterSystemTokenCertificates,
                      base::Unretained(all_certs.get()), std::move(system_slot)),
       base::BindOnce(&CertLoader::UpdateCertificates,
                      weak_factory_.GetWeakPtr(), std::move(all_certs)));
 }
 
 void CertLoader::UpdateCertificates(
     std::unique_ptr<net::CertificateList> all_certs,
     std::unique_ptr<net::CertificateList> system_certs) {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ skipping 18 matching lines @@
   for (auto& observer : observers_)
     observer.OnCertificatesLoaded(*all_certs_, initial_load);
 }
 
 void CertLoader::OnCertDBChanged() {
   VLOG(1) << "OnCertDBChanged";
   LoadCertificates();
 }
 
 }  // namespace chromeos