Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/system/automatic_reboot_manager.cc

 // Copyright (c) 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/system/automatic_reboot_manager.h"
 
 #include <fcntl.h>
 #include <stddef.h>
 #include <sys/stat.h>
 #include <sys/types.h>
@@ skipping 218 matching lines @@
 void AutomaticRebootManager::UpdateStatusChanged(
     const UpdateEngineClient::Status& status) {
   // Ignore repeated notifications that a reboot is necessary. This is important
   // so that only the time of the first notification is taken into account and
   // repeated notifications do not postpone the reboot request and grace period.
   if (status.status != UpdateEngineClient::UPDATE_STATUS_UPDATED_NEED_REBOOT ||
       !have_boot_time_ || have_update_reboot_needed_time_) {
     return;
   }
 
-  base::PostTaskWithTraits(
-      FROM_HERE,
-      base::TaskTraits()
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .WithShutdownBehavior(base::TaskShutdownBehavior::BLOCK_SHUTDOWN)
-          .MayBlock(),
-      base::Bind(&SaveUpdateRebootNeededUptime));
+  base::PostTaskWithTraits(FROM_HERE,
+                           {base::MayBlock(), base::TaskPriority::BACKGROUND,
+                            base::TaskShutdownBehavior::BLOCK_SHUTDOWN},
+                           base::Bind(&SaveUpdateRebootNeededUptime));
 
   update_reboot_needed_time_ = clock_->NowTicks();
   have_update_reboot_needed_time_ = true;
 
   Reschedule();
 }
 
 void AutomaticRebootManager::OnUserActivity(const ui::Event* event) {
   if (!login_screen_idle_timer_)
     return;
@@ skipping 161 matching lines @@
   }
 
   login_screen_idle_timer_.reset();
   grace_start_timer_.reset();
   grace_end_timer_.reset();
   DBusThreadManager::Get()->GetPowerManagerClient()->RequestRestart();
 }
 
 }  // namespace system
 }  // namespace chromeos