Use constexpr TaskTraits constructor in chrome.

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

Index: chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc b/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
index f35240584ef53dc805b16f4434fa7b9c03e5a1ef..660055c2066d2d3e676826712d55846182c3ef94 100644
--- a/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
@@ -1353,8 +1353,7 @@ void ChromeUserManagerImpl::ScheduleResolveLocale(
     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);
 }