Use constexpr TaskTraits constructor in chrome.

chrome/browser/safe_browsing/sandboxed_dmg_analyzer_mac.cc

 // Copyright 2015 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/safe_browsing/sandboxed_dmg_analyzer_mac.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/task_scheduler/post_task.h"
 #include "chrome/common/safe_browsing/zip_analyzer_results.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace safe_browsing {
 
 SandboxedDMGAnalyzer::SandboxedDMGAnalyzer(const base::FilePath& dmg_file,
                                            const ResultCallback& callback)
     : file_path_(dmg_file), callback_(callback) {
   DCHECK(callback);
 }
 
 void SandboxedDMGAnalyzer::Start() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   base::PostTaskWithTraits(
       FROM_HERE,
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::BACKGROUND)
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&SandboxedDMGAnalyzer::PrepareFileToAnalyze, this));
 }
 
 SandboxedDMGAnalyzer::~SandboxedDMGAnalyzer() = default;
 
 void SandboxedDMGAnalyzer::PrepareFileToAnalyze() {
   base::File file(file_path_, base::File::FLAG_OPEN | base::File::FLAG_READ);
 
   if (!file.IsValid()) {
     DLOG(ERROR) << "Could not open file: " << file_path_.value();
@@ skipping 33 matching lines @@
 }
 
 void SandboxedDMGAnalyzer::AnalyzeFileDone(const Results& results) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   utility_process_mojo_client_.reset();
   callback_.Run(results);
 }
 
 }  // namespace safe_browsing