Use constexpr TaskTraits constructor in chrome.

chrome/browser/ui/webui/settings/chromeos/device_storage_handler.cc

Index: chrome/browser/ui/webui/settings/chromeos/device_storage_handler.cc
diff --git a/chrome/browser/ui/webui/settings/chromeos/device_storage_handler.cc b/chrome/browser/ui/webui/settings/chromeos/device_storage_handler.cc
index 9e611a43cfdefb6c40483b1ca487794ac838f935..640996c02087ef627f23aecb931d845517966189 100644
--- a/chrome/browser/ui/webui/settings/chromeos/device_storage_handler.cc
+++ b/chrome/browser/ui/webui/settings/chromeos/device_storage_handler.cc
@@ -143,10 +143,7 @@ void StorageHandler::UpdateSizeStat() {
   int64_t* total_size = new int64_t(0);
   int64_t* available_size = new int64_t(0);
   base::PostTaskWithTraitsAndReply(
-      FROM_HERE,
-      base::TaskTraits()
-          .WithPriority(base::TaskPriority::USER_VISIBLE)
-          .MayBlock(),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
       base::Bind(&GetSizeStatBlocking, downloads_path, total_size,
                  available_size),
       base::Bind(&StorageHandler::OnGetSizeStat, base::Unretained(this),
@@ -183,8 +180,7 @@ void StorageHandler::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(&StorageHandler::OnGetDownloadsSize, base::Unretained(this)));
 }