Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/boot_times_recorder.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/boot_times_recorder.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
@@ skipping 193 matching lines @@
   uptime.resize(space_at);
 
   if (base::StringToDouble(uptime, result))
     return true;
 
   return false;
 }
 
 void BootTimesRecorder::Stats::RecordStats(const std::string& name) const {
   base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&BootTimesRecorder::Stats::RecordStatsAsync,
                  base::Owned(new Stats(*this)), name));
 }
 
 void BootTimesRecorder::Stats::RecordStatsWithCallback(
     const std::string& name,
     const base::Closure& callback) const {
   base::PostTaskWithTraitsAndReply(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&BootTimesRecorder::Stats::RecordStatsAsync,
                  base::Owned(new Stats(*this)), name),
       callback);
 }
 
 void BootTimesRecorder::Stats::RecordStatsAsync(
     const base::FilePath::StringType& name) const {
   const base::FilePath log_path(kLogPath);
   const base::FilePath uptime_output =
       log_path.Append(base::FilePath(kUptimePrefix + name));
@@ skipping 287 matching lines @@
           GetRenderWidgetHost(&web_contents->GetController());
       render_widget_hosts_loading_.erase(render_widget_host);
       break;
     }
     default:
       break;
   }
 }
 
 }  // namespace chromeos