Use constexpr TaskTraits constructor in chromeos.

chromeos/settings/timezone_settings.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 "chromeos/settings/timezone_settings.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
@@ skipping 373 matching lines @@
   // go on with |timezone|.
   const icu::TimeZone* known_timezone = GetKnownTimezoneOrNull(timezone);
   if (!known_timezone)
     known_timezone = &timezone;
 
   timezone_.reset(known_timezone->clone());
   std::string id = base::UTF16ToUTF8(GetTimezoneID(*known_timezone));
   VLOG(1) << "Setting timezone to " << id;
   // It's safe to change the timezone config files in the background as the
   // following operations don't depend on the completion of the config change.
-  base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .WithPriority(base::TaskPriority::BACKGROUND)
-                     .MayBlock(),
-      base::Bind(&SetTimezoneIDFromString, id));
+  base::PostTaskWithTraits(FROM_HERE,
+                           {base::MayBlock(), base::TaskPriority::BACKGROUND,
+                            base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
+                           base::Bind(&SetTimezoneIDFromString, id));
   icu::TimeZone::setDefault(*known_timezone);
   for (auto& observer : observers_)
     observer.TimezoneChanged(*known_timezone);
 }
 
 // static
 TimezoneSettingsImpl* TimezoneSettingsImpl::GetInstance() {
   return base::Singleton<
       TimezoneSettingsImpl,
       base::DefaultSingletonTraits<TimezoneSettingsImpl>>::get();
@@ skipping 71 matching lines @@
 }
 
 // static
 base::string16 TimezoneSettings::GetTimezoneID(const icu::TimeZone& timezone) {
   icu::UnicodeString id;
   return base::i18n::UnicodeStringToString16(timezone.getID(id));
 }
 
 }  // namespace system
 }  // namespace chromeos