Use constexpr TaskTraits constructor in chrome.

chrome/browser/ui/webui/settings/about_handler.cc

 // Copyright 2016 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/ui/webui/settings/about_handler.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 467 matching lines @@
         VersionUpdater::PromoteCallback());
   }
 }
 
 void AboutHandler::HandleGetVersionInfo(const base::ListValue* args) {
   CHECK_EQ(1U, args->GetSize());
   std::string callback_id;
   CHECK(args->GetString(0, &callback_id));
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::USER_VISIBLE),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
       base::Bind(&GetVersionInfo),
       base::Bind(&AboutHandler::OnGetVersionInfoReady,
                  weak_factory_.GetWeakPtr(), callback_id));
 }
 
 void AboutHandler::OnGetVersionInfoReady(
     std::string callback_id,
     std::unique_ptr<base::DictionaryValue> version_info) {
   ResolveJavascriptCallback(base::Value(callback_id), *version_info);
 }
 
 void AboutHandler::HandleGetRegulatoryInfo(const base::ListValue* args) {
   CHECK_EQ(1U, args->GetSize());
   std::string callback_id;
   CHECK(args->GetString(0, &callback_id));
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::USER_VISIBLE),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
       base::Bind(&FindRegulatoryLabelDir),
       base::Bind(&AboutHandler::OnRegulatoryLabelDirFound,
                  weak_factory_.GetWeakPtr(), callback_id));
 }
 
 void AboutHandler::HandleGetChannelInfo(const base::ListValue* args) {
   CHECK_EQ(1U, args->GetSize());
   std::string callback_id;
   CHECK(args->GetString(0, &callback_id));
   version_updater_->GetChannel(
@@ skipping 99 matching lines @@
 #if defined(OS_CHROMEOS)
 void AboutHandler::OnRegulatoryLabelDirFound(
     std::string callback_id,
     const base::FilePath& label_dir_path) {
   if (label_dir_path.empty()) {
     ResolveJavascriptCallback(base::Value(callback_id), base::Value());
     return;
   }
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::USER_VISIBLE),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
       base::Bind(&ReadRegulatoryLabelText, label_dir_path),
       base::Bind(&AboutHandler::OnRegulatoryLabelTextRead,
                  weak_factory_.GetWeakPtr(), callback_id, label_dir_path));
 }
 
 void AboutHandler::OnRegulatoryLabelTextRead(
     std::string callback_id,
     const base::FilePath& label_dir_path,
     const std::string& text) {
   std::unique_ptr<base::DictionaryValue> regulatory_info(
       new base::DictionaryValue);
   // Remove unnecessary whitespace.
   regulatory_info->SetString("text", base::CollapseWhitespaceASCII(text, true));
 
   std::string image_path =
       label_dir_path.AppendASCII(kRegulatoryLabelImageFilename).MaybeAsASCII();
   std::string url =
       std::string("chrome://") + chrome::kChromeOSAssetHost + "/" + image_path;
   regulatory_info->SetString("url", url);
 
   ResolveJavascriptCallback(base::Value(callback_id), *regulatory_info);
 }
 #endif  // defined(OS_CHROMEOS)
 
 }  // namespace settings