Use constexpr TaskTraits constructor in chrome.

chrome/browser/metrics/google_update_metrics_provider_win.cc

 // Copyright 2014 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/metrics/google_update_metrics_provider_win.h"
 
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/task_scheduler/post_task.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 39 matching lines @@
 void GoogleUpdateMetricsProviderWin::GetGoogleUpdateData(
     const base::Closure& done_callback) {
   if (!IsOfficialBuild()) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, done_callback);
     return;
   }
 
   // Schedules a task on a blocking pool thread to gather Google Update
   // statistics (requires Registry reads).
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&GoogleUpdateMetricsProviderWin::GetGoogleUpdateDataBlocking),
       base::Bind(&GoogleUpdateMetricsProviderWin::ReceiveGoogleUpdateData,
                  weak_ptr_factory_.GetWeakPtr(), done_callback));
 }
 
 void GoogleUpdateMetricsProviderWin::ProvideSystemProfileMetrics(
     metrics::SystemProfileProto* system_profile_proto) {
   if (!IsOfficialBuild())
     return;
 
@@ skipping 50 matching lines @@
   GoogleUpdateSettings::GetUpdateDetail(&google_update_metrics.product_data);
   return google_update_metrics;
 }
 
 void GoogleUpdateMetricsProviderWin::ReceiveGoogleUpdateData(
     const base::Closure& done_callback,
     const GoogleUpdateMetrics& google_update_metrics) {
   google_update_metrics_ = google_update_metrics;
   done_callback.Run();
 }