Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc

 // Copyright 2014 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/login/users/chrome_user_manager_impl.h"
 
 #include <stddef.h>
 
 #include <cstddef>
 #include <set>
@@ skipping 1335 matching lines @@
 base::string16 ChromeUserManagerImpl::GetResourceStringUTF16(
     int string_id) const {
   return l10n_util::GetStringUTF16(string_id);
 }
 
 void ChromeUserManagerImpl::ScheduleResolveLocale(
     const std::string& locale,
     const base::Closure& on_resolved_callback,
     std::string* out_resolved_locale) const {
   base::PostTaskWithTraitsAndReply(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(ResolveLocale, locale, base::Unretained(out_resolved_locale)),
       on_resolved_callback);
 }
 
 bool ChromeUserManagerImpl::IsValidDefaultUserImageId(int image_index) const {
   return image_index >= 0 &&
          image_index < chromeos::default_user_image::kDefaultImagesCount;
 }
 
 std::unique_ptr<user_manager::User>
@@ skipping 13 matching lines @@
       break;
     default:
       NOTREACHED();
       break;
   }
 
   return user;
 }
 
 }  // namespace chromeos