Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/base/locale_util.cc

Index: chrome/browser/chromeos/base/locale_util.cc
diff --git a/chrome/browser/chromeos/base/locale_util.cc b/chrome/browser/chromeos/base/locale_util.cc
index e0621909392862d611cb29d8b4219c74d604dc5c..8e4bf4b7ee8eda718a8152312403a9edaa7f34a0 100644
--- a/chrome/browser/chromeos/base/locale_util.cc
+++ b/chrome/browser/chromeos/base/locale_util.cc
@@ -124,9 +124,7 @@ void SwitchLanguage(const std::string& locale,
   base::Closure reloader(
       base::Bind(&SwitchLanguageDoReloadLocale, base::Unretained(data.get())));
   base::PostTaskWithTraitsAndReply(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
-      reloader,
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND}, reloader,
       base::Bind(&FinishSwitchLanguage, base::Passed(std::move(data))));
 }