Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/arc/arc_util.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/arc/arc_util.h"
 
 #include <linux/magic.h>
 #include <sys/statfs.h>
 
 #include "base/callback.h"
@@ skipping 242 matching lines @@
 
   // If the compatibility has been already confirmed, skip the check.
   if (GetFileSystemCompatibilityPref(account_id) != kFileSystemIncompatible) {
     callback.Run();
     return;
   }
 
   // Otherwise, check the underlying filesystem.
   base::PostTaskWithTraitsAndReplyWithResult(
       FROM_HERE,
-      base::TaskTraits()
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-          .WithPriority(base::TaskPriority::USER_BLOCKING)
-          .MayBlock(),
+      {base::MayBlock(), base::TaskPriority::USER_BLOCKING,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&IsArcCompatibleFilesystem, profile_path),
       base::Bind(&StoreCompatibilityCheckResult, account_id, callback));
 }
 
 }  // namespace arc