Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/app_mode/kiosk_app_data_base.cc

Index: chrome/browser/chromeos/app_mode/kiosk_app_data_base.cc
diff --git a/chrome/browser/chromeos/app_mode/kiosk_app_data_base.cc b/chrome/browser/chromeos/app_mode/kiosk_app_data_base.cc
index 759a8876ada4e9b8e6f825d52418680c4386b21f..315d3353116a7d41d247c763106199a5693b1ef5 100644
--- a/chrome/browser/chromeos/app_mode/kiosk_app_data_base.cc
+++ b/chrome/browser/chromeos/app_mode/kiosk_app_data_base.cc
@@ -120,9 +120,7 @@ void KioskAppDataBase::ClearCache() {
 
   if (!icon_path_.empty()) {
     base::PostTaskWithTraits(
-        FROM_HERE,
-        base::TaskTraits().MayBlock().WithPriority(
-            base::TaskPriority::BACKGROUND),
+        FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
         base::Bind(base::IgnoreResult(&base::DeleteFile), icon_path_, false));
   }
 }