Use constexpr TaskTraits constructor in chrome.

chrome/browser/ui/views/apps/app_info_dialog/app_info_summary_panel.cc

Index: chrome/browser/ui/views/apps/app_info_dialog/app_info_summary_panel.cc
diff --git a/chrome/browser/ui/views/apps/app_info_dialog/app_info_summary_panel.cc b/chrome/browser/ui/views/apps/app_info_dialog/app_info_summary_panel.cc
index 84b0b8be72a1323b9bc4aaaa2402c2f929736a73..4af7c7783d29d0a07f63cfff2da20e3a62893c52 100644
--- a/chrome/browser/ui/views/apps/app_info_dialog/app_info_summary_panel.cc
+++ b/chrome/browser/ui/views/apps/app_info_dialog/app_info_summary_panel.cc
@@ -281,8 +281,7 @@ void AppInfoSummaryPanel::LinkClicked(views::Link* source, int event_flags) {
 
 void AppInfoSummaryPanel::StartCalculatingAppSize() {
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::USER_VISIBLE),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::USER_VISIBLE},
       base::Bind(&base::ComputeDirectorySize, app_->path()),
       base::Bind(&AppInfoSummaryPanel::OnAppSizeCalculated, AsWeakPtr()));
 }