Use constexpr TaskTraits constructor in chrome.

chrome/browser/budget_service/budget_database.cc

 // Copyright 2016 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/budget_service/budget_database.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/task_scheduler/post_task.h"
 #include "base/time/clock.h"
@@ skipping 34 matching lines @@
   chunks = std::move(other.chunks);
 }
 
 BudgetDatabase::BudgetInfo::~BudgetInfo() {}
 
 BudgetDatabase::BudgetDatabase(Profile* profile,
                                const base::FilePath& database_dir)
     : profile_(profile),
       db_(new leveldb_proto::ProtoDatabaseImpl<budget_service::Budget>(
           base::CreateSequencedTaskRunnerWithTraits(
-              base::TaskTraits()
-                  .MayBlock()
-                  .WithPriority(base::TaskPriority::BACKGROUND)
-                  .WithShutdownBehavior(
-                      base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)))),
+              {base::MayBlock(), base::TaskPriority::BACKGROUND,
+               base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN}))),
       clock_(base::WrapUnique(new base::DefaultClock)),
       weak_ptr_factory_(this) {
   db_->Init(kDatabaseUMAName, database_dir,
             base::Bind(&BudgetDatabase::OnDatabaseInit,
                        weak_ptr_factory_.GetWeakPtr()));
 }
 
 BudgetDatabase::~BudgetDatabase() {}
 
 void BudgetDatabase::GetBudgetDetails(const url::Origin& origin,
@@ skipping 299 matching lines @@
           clock_->Now() - base::TimeDelta::FromDays(kBudgetDurationInDays)) {
     budget_map_.erase(origin);
     return true;
   }
 
   // Although some things may have expired, there are some chunks still valid.
   // Don't write to the DB now, write either when all chunks expire or when the
   // origin spends some budget.
   return false;
 }