Use constexpr TaskTraits constructor in chrome.

chrome/browser/android/offline_pages/offline_page_request_job.cc

 // Copyright 2016 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/android/offline_pages/offline_page_request_job.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 543 matching lines @@
 
 OfflinePageRequestJob::OfflinePageRequestJob(
     net::URLRequest* request,
     net::NetworkDelegate* network_delegate,
     previews::PreviewsDecider* previews_decider)
     : net::URLRequestFileJob(
           request,
           network_delegate,
           base::FilePath(),
           base::CreateTaskRunnerWithTraits(
-              base::TaskTraits()
-                  .MayBlock()
-                  .WithPriority(base::TaskPriority::USER_VISIBLE)
-                  .WithShutdownBehavior(
-                      base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN))),
+              {base::MayBlock(), base::TaskPriority::USER_VISIBLE,
+               base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN})),
       delegate_(new DefaultDelegate()),
       previews_decider_(previews_decider),
       weak_ptr_factory_(this) {}
 
 OfflinePageRequestJob::~OfflinePageRequestJob() {
 }
 
 void OfflinePageRequestJob::Start() {
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(&OfflinePageRequestJob::StartAsync,
@@ skipping 130 matching lines @@
 
   URLRequestJob::NotifyHeadersComplete();
 }
 
 void OfflinePageRequestJob::SetDelegateForTesting(
     std::unique_ptr<Delegate> delegate) {
   delegate_ = std::move(delegate);
 }
 
 }  // namespace offline_pages