Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/login/supervised/supervised_user_authentication.cc

 // Copyright 2014 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/chromeos/login/supervised/supervised_user_authentication.h"
 
 #include "base/base64.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/macros.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 271 matching lines @@
 void SupervisedUserAuthentication::LoadPasswordUpdateData(
     const std::string& user_id,
     const PasswordDataCallback& success_callback,
     const base::Closure& failure_callback) {
   const user_manager::User* user = user_manager::UserManager::Get()->FindUser(
       AccountId::FromUserEmail(user_id));
   base::FilePath profile_path =
       ProfileHelper::GetProfilePathByUserIdHash(user->username_hash());
   PostTaskWithTraitsAndReplyWithResult(
       FROM_HERE,
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::BindOnce(&LoadPasswordData, profile_path),
       base::BindOnce(&OnPasswordDataLoaded, success_callback,
                      failure_callback));
 }
 
 std::string SupervisedUserAuthentication::BuildPasswordSignature(
     const std::string& password,
     int revision,
     const std::string& base64_signature_key) {
   ac::chrome::managedaccounts::account::Secret secret;
@@ skipping 14 matching lines @@
     LOG(FATAL) << "HMAC::Sign failed";
 
   std::string raw_result(out_bytes, out_bytes + sizeof(out_bytes));
 
   std::string result;
   base::Base64Encode(raw_result, &result);
   return result;
 }
 
 }  // namespace chromeos