Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/app_mode/kiosk_app_manager.cc

 // Copyright 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 "chrome/browser/chromeos/app_mode/kiosk_app_manager.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 401 matching lines @@
   policy::BrowserPolicyConnectorChromeOS* connector =
       g_browser_process->platform_part()->browser_policy_connector_chromeos();
   InstallAttributes* attributes = connector->GetInstallAttributes();
   switch (attributes->GetMode()) {
     case policy::DEVICE_MODE_NOT_SET: {
       if (!base::SysInfo::IsRunningOnChromeOS()) {
         status = CONSUMER_KIOSK_AUTO_LAUNCH_CONFIGURABLE;
       } else if (!ownership_established_) {
         bool* owner_present = new bool(false);
         base::PostTaskWithTraitsAndReply(
-            FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                           base::TaskPriority::BACKGROUND),
+            FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
             base::Bind(&CheckOwnerFilePresence, owner_present),
             base::Bind(&KioskAppManager::OnOwnerFileChecked,
                        base::Unretained(this), callback,
                        base::Owned(owner_present)));
         return;
       }
       break;
     }
     case policy::DEVICE_MODE_CONSUMER_KIOSK_AUTOLAUNCH:
       status = CONSUMER_KIOSK_AUTO_LAUNCH_ENABLED;
@@ skipping 534 matching lines @@
 base::TimeDelta KioskAppManager::GetAutoLaunchDelay() const {
   int delay;
   if (!CrosSettings::Get()->GetInteger(
           kAccountsPrefDeviceLocalAccountAutoLoginDelay, &delay)) {
     return base::TimeDelta();  // Default delay is 0ms.
   }
   return base::TimeDelta::FromMilliseconds(delay);
 }
 
 }  // namespace chromeos