Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/settings/session_manager_operation.cc

 // Copyright (c) 2012 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/settings/session_manager_operation.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 72 matching lines @@
 
 void SessionManagerOperation::ReportResult(
     DeviceSettingsService::Status status) {
   callback_.Run(this, status);
 }
 
 void SessionManagerOperation::EnsurePublicKey(const base::Closure& callback) {
   if (force_key_load_ || !public_key_ || !public_key_->is_loaded()) {
     scoped_refptr<base::TaskRunner> task_runner =
         base::CreateTaskRunnerWithTraits(
-            base::TaskTraits()
-                .MayBlock()
-                .WithPriority(base::TaskPriority::BACKGROUND)
-                .WithShutdownBehavior(
-                    base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN));
+            {base::MayBlock(), base::TaskPriority::BACKGROUND,
+             base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN});
     base::PostTaskAndReplyWithResult(
         task_runner.get(), FROM_HERE,
         base::Bind(&SessionManagerOperation::LoadPublicKey, owner_key_util_,
                    force_key_load_ ? nullptr : public_key_),
         base::Bind(&SessionManagerOperation::StorePublicKey,
                    weak_factory_.GetWeakPtr(), callback));
   } else {
     callback.Run();
   }
 }
@@ skipping 162 matching lines @@
 }
 
 void StoreSettingsOperation::HandleStoreResult(bool success) {
   if (!success)
     ReportResult(DeviceSettingsService::STORE_OPERATION_FAILED);
   else
     StartLoading();
 }
 
 }  // namespace chromeos