Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/customization/customization_document.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/customization/customization_document.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 848 matching lines @@
   std::unique_ptr<bool> exists(new bool(false));
 
   base::Closure check_file_exists =
       base::Bind(&CheckWallpaperCacheExists,
                  GetCustomizedWallpaperDownloadedFileName(),
                  base::Unretained(exists.get()));
   base::Closure on_checked_closure = base::Bind(
       &ServicesCustomizationDocument::OnCheckedWallpaperCacheExists,
       weak_ptr_factory_.GetWeakPtr(), base::Passed(std::move(exists)),
       base::Passed(std::move(applying)));
-  base::PostTaskWithTraitsAndReply(FROM_HERE,
-                                   base::TaskTraits().MayBlock().WithPriority(
-                                       base::TaskPriority::BACKGROUND),
-                                   check_file_exists, on_checked_closure);
+  base::PostTaskWithTraitsAndReply(
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
+      check_file_exists, on_checked_closure);
 }
 
 void ServicesCustomizationDocument::OnCheckedWallpaperCacheExists(
     std::unique_ptr<bool> exists,
     std::unique_ptr<ServicesCustomizationDocument::ApplyingTask> applying) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(exists);
   DCHECK(applying);
 
   ApplyWallpaper(*exists, std::move(applying));
@@ skipping 75 matching lines @@
   apply_tasks_success_ += success;
 
   if (apply_tasks_started_ != apply_tasks_finished_)
     return;
 
   if (apply_tasks_success_ == apply_tasks_finished_)
     SetApplied(true);
 }
 
 }  // namespace chromeos