Use constexpr TaskTraits constructor in chrome.

chrome/browser/extensions/api/messaging/native_process_launcher.cc

Index: chrome/browser/extensions/api/messaging/native_process_launcher.cc
diff --git a/chrome/browser/extensions/api/messaging/native_process_launcher.cc b/chrome/browser/extensions/api/messaging/native_process_launcher.cc
index a7a0a822b3e0e754805132076fb8025f98775012..2527742857c11e1897018ebfd0e26d32a8542bc0 100644
--- a/chrome/browser/extensions/api/messaging/native_process_launcher.cc
+++ b/chrome/browser/extensions/api/messaging/native_process_launcher.cc
@@ -108,8 +108,7 @@ void NativeProcessLauncherImpl::Core::Launch(
     const std::string& native_host_name,
     const LaunchedCallback& callback) {
   base::PostTaskWithTraits(FROM_HERE,
-                           base::TaskTraits().MayBlock().WithPriority(
-                               base::TaskPriority::USER_VISIBLE),
+                           {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
                            base::BindOnce(&Core::DoLaunchOnThreadPool, this,
                                           origin, native_host_name, callback));
 }