Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/hats/hats_notification_controller.cc

 // Copyright (c) 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/chromeos/hats/hats_notification_controller.h"
 
 #include "ash/strings/grit/ash_strings.h"
 #include "ash/system/system_notifier.h"
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 96 matching lines @@
 const char HatsNotificationController::kGoogleIcon2xUrl[] =
     "https://www.gstatic.com/images/branding/product/2x/googleg_48dp.png";
 
 HatsNotificationController::HatsNotificationController(
     Profile* profile,
     image_fetcher::ImageFetcher* image_fetcher)
     : profile_(profile),
       image_fetcher_(image_fetcher),
       weak_pointer_factory_(this) {
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&IsNewDevice, kHatsNewDeviceThresholdDays),
       base::Bind(&HatsNotificationController::Initialize,
                  weak_pointer_factory_.GetWeakPtr()));
 }
 
 HatsNotificationController::~HatsNotificationController() {
   if (network_portal_detector::IsInitialized())
     network_portal_detector::GetInstance()->RemoveObserver(this);
 }
 
@@ skipping 155 matching lines @@
       GURL(kNotificationOriginUrl), kNotificationId, optional, this);
 }
 
 void HatsNotificationController::UpdateLastInteractionTime() {
   PrefService* pref_service = profile_->GetPrefs();
   pref_service->SetInt64(prefs::kHatsLastInteractionTimestamp,
                          base::Time::Now().ToInternalValue());
 }
 
 }  // namespace chromeos