Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/hats/hats_dialog.cc

Index: chrome/browser/chromeos/hats/hats_dialog.cc
diff --git a/chrome/browser/chromeos/hats/hats_dialog.cc b/chrome/browser/chromeos/hats/hats_dialog.cc
index dc9ae4d9da055d6722e24ae5a55a051a30d9814e..fa054c1d92274a7bfe4000aff92e866896319dbb 100644
--- a/chrome/browser/chromeos/hats/hats_dialog.cc
+++ b/chrome/browser/chromeos/hats/hats_dialog.cc
@@ -125,8 +125,7 @@ void HatsDialog::CreateAndShow(bool is_google_account) {
   std::unique_ptr<HatsDialog> hats_dialog(new HatsDialog);
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&GetFormattedSiteContext, user_locale, kDeviceInfoStopKeyword),
       base::Bind(&HatsDialog::Show, base::Passed(&hats_dialog),
                  is_google_account ? kGooglerSiteID : kSiteID));