Use constexpr TaskTraits constructor in chrome.

chrome/browser/ui/webui/version_handler_chromeos.cc

Index: chrome/browser/ui/webui/version_handler_chromeos.cc
diff --git a/chrome/browser/ui/webui/version_handler_chromeos.cc b/chrome/browser/ui/webui/version_handler_chromeos.cc
index 676496b759d9b1f546878a03a160f1ce1b6c4b2b..95bdee7b4b3036e9e4c685010be90a15bf1c622c 100644
--- a/chrome/browser/ui/webui/version_handler_chromeos.cc
+++ b/chrome/browser/ui/webui/version_handler_chromeos.cc
@@ -16,21 +16,18 @@ void VersionHandlerChromeOS::HandleRequestVersionInfo(
     const base::ListValue* args) {
   // Start the asynchronous load of the versions.
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&chromeos::version_loader::GetVersion,
                  chromeos::version_loader::VERSION_FULL),
       base::Bind(&VersionHandlerChromeOS::OnVersion,
                  weak_factory_.GetWeakPtr()));
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&chromeos::version_loader::GetFirmware),
       base::Bind(&VersionHandlerChromeOS::OnOSFirmware,
                  weak_factory_.GetWeakPtr()));
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&chromeos::version_loader::GetARCVersion),
       base::Bind(&VersionHandlerChromeOS::OnARCVersion,
                  weak_factory_.GetWeakPtr()));