Use constexpr TaskTraits constructor in net.

net/base/directory_lister.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 "net/base/directory_lister.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 63 matching lines @@
   DCHECK(delegate_);
   DCHECK(!dir.value().empty());
 }
 
 DirectoryLister::~DirectoryLister() {
   Cancel();
 }
 
 void DirectoryLister::Start() {
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits().MayBlock().WithShutdownBehavior(
-                     base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&Core::Start, core_));
 }
 
 void DirectoryLister::Cancel() {
   core_->CancelOnOriginThread();
 }
 
 DirectoryLister::Core::Core(const base::FilePath& dir,
                             ListingType type,
                             DirectoryLister* lister)
@@ skipping 97 matching lines @@
 
 void DirectoryLister::OnListFile(const DirectoryListerData& data) {
   delegate_->OnListFile(data);
 }
 
 void DirectoryLister::OnListDone(int error) {
   delegate_->OnListDone(error);
 }
 
 }  // namespace net