Use constexpr TaskTraits constructor in chrome.

chrome/browser/web_applications/web_app_win.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/web_applications/web_app_win.h"
 
 #include <shlobj.h>
 #include <stddef.h>
 
 #include <memory>
@@ skipping 356 matching lines @@
 
   // Set window's icon to the one we're about to create/update in the web app
   // path. The icon cache will refresh on icon creation.
   base::FilePath web_app_path = web_app::GetWebAppDataDirectory(
       shortcut_info->profile_path, shortcut_info->extension_id,
       shortcut_info->url);
   base::FilePath icon_file =
       web_app::internals::GetIconFilePath(web_app_path, shortcut_info->title);
   const web_app::ShortcutInfo& shortcut_info_ref = *shortcut_info;
   base::PostTaskWithTraitsAndReply(
-      FROM_HERE,
-      base::TaskTraits().MayBlock().WithPriority(
-          base::TaskPriority::USER_VISIBLE),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
       base::Bind(&CreateIconAndSetRelaunchDetails, web_app_path, icon_file,
                  base::ConstRef(shortcut_info_ref), hwnd),
       base::Bind(&web_app::internals::DeleteShortcutInfoOnUIThread,
                  base::Passed(&shortcut_info), base::Closure()));
 }
 
 }  // namespace
 
 namespace web_app {
 
@@ skipping 221 matching lines @@
 
 }  // namespace internals
 
 void UpdateShortcutForTabContents(content::WebContents* web_contents) {
   // UpdateShortcutWorker will delete itself when it's done.
   UpdateShortcutWorker* worker = new UpdateShortcutWorker(web_contents);
   worker->Run();
 }
 
 }  // namespace web_app