Use constexpr TaskTraits constructor in chrome.

chrome/browser/ui/webui/options/chromeos/storage_manager_handler.cc

Index: chrome/browser/ui/webui/options/chromeos/storage_manager_handler.cc
diff --git a/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.cc b/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.cc
index 98da03ec6830d5b6119cb2d88ffc45c66274731e..d73852c003a8e8d2613d81f4ee78a6b4d3d6e8aa 100644
--- a/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.cc
+++ b/chrome/browser/ui/webui/options/chromeos/storage_manager_handler.cc
@@ -212,8 +212,7 @@ void StorageManagerHandler::UpdateSizeStat() {
   int64_t* total_size = new int64_t(0);
   int64_t* available_size = new int64_t(0);
   base::PostTaskWithTraitsAndReply(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&GetSizeStatAsync, downloads_path, total_size, available_size),
       base::Bind(&StorageManagerHandler::OnGetSizeStat,
                  weak_ptr_factory_.GetWeakPtr(), base::Owned(total_size),
@@ -250,8 +249,7 @@ void StorageManagerHandler::UpdateDownloadsSize() {
       file_manager::util::GetDownloadsFolderForProfile(profile);
 
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&base::ComputeDirectorySize, downloads_path),
       base::Bind(&StorageManagerHandler::OnGetDownloadsSize,
                  weak_ptr_factory_.GetWeakPtr()));