Use constexpr TaskTraits constructor in components.

components/wallpaper/wallpaper_manager_base.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 "components/wallpaper/wallpaper_manager_base.h"
 
 #include <numeric>
 #include <vector>
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 771 matching lines @@
   file_to_remove.push_back(wallpaper_path.Append(account_id.GetUserEmail()));
   wallpaper_path = wallpaper_path.Append(path_to_file);
   file_to_remove.push_back(wallpaper_path);
 
   // Remove original user wallpaper.
   wallpaper_path = GetCustomWallpaperDir(kOriginalWallpaperSubDir);
   file_to_remove.push_back(wallpaper_path.Append(account_id.GetUserEmail()));
   wallpaper_path = wallpaper_path.Append(path_to_file);
   file_to_remove.push_back(wallpaper_path);
 
-  base::PostTaskWithTraits(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .WithPriority(base::TaskPriority::BACKGROUND)
-                     .MayBlock(),
-      base::Bind(&DeleteWallpaperInList, file_to_remove));
+  base::PostTaskWithTraits(FROM_HERE,
+                           {base::MayBlock(), base::TaskPriority::BACKGROUND,
+                            base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
+                           base::Bind(&DeleteWallpaperInList, file_to_remove));
 }
 
 void WallpaperManagerBase::SetCommandLineForTesting(
     base::CommandLine* command_line) {
   command_line_for_testing_ = command_line;
   SetDefaultWallpaperPathsFromCommandLine(command_line);
 }
 
 base::CommandLine* WallpaperManagerBase::GetCommandLine() {
   base::CommandLine* command_line =
@@ skipping 245 matching lines @@
 void WallpaperManagerBase::CreateSolidDefaultWallpaper() {
   loaded_wallpapers_for_test_++;
   SkBitmap bitmap;
   bitmap.allocN32Pixels(1, 1);
   bitmap.eraseColor(kDefaultWallpaperColor);
   const gfx::ImageSkia image = gfx::ImageSkia::CreateFrom1xBitmap(bitmap);
   default_wallpaper_image_.reset(new user_manager::UserImage(image));
 }
 
 }  // namespace wallpaper