Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/policy/system_log_uploader.cc

Index: chrome/browser/chromeos/policy/system_log_uploader.cc
diff --git a/chrome/browser/chromeos/policy/system_log_uploader.cc b/chrome/browser/chromeos/policy/system_log_uploader.cc
index 38a7df2f9f315abbd8e0b378be26b55e4625b7f2..6721da9296a3fb415dae04d82880aab4a591a997 100644
--- a/chrome/browser/chromeos/policy/system_log_uploader.cc
+++ b/chrome/browser/chromeos/policy/system_log_uploader.cc
@@ -96,8 +96,7 @@ void SystemLogDelegate::LoadSystemLogs(
   // Run ReadFiles() in the thread that interacts with the file system and
   // return system logs to |upload_callback| on the current thread.
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&ReadFiles), upload_callback);
 }