Use constexpr TaskTraits constructor in chrome.

chrome/browser/chrome_browser_main_android.cc

Index: chrome/browser/chrome_browser_main_android.cc
diff --git a/chrome/browser/chrome_browser_main_android.cc b/chrome/browser/chrome_browser_main_android.cc
index a788005129d7f680ef90198827a506ac0ed68ed9..bb13ba018c02e8d1f6bbed7ff5af58d719cfd8f7 100644
--- a/chrome/browser/chrome_browser_main_android.cc
+++ b/chrome/browser/chrome_browser_main_android.cc
@@ -144,8 +144,7 @@ void ChromeBrowserMainPartsAndroid::PostBrowserStart() {
   ChromeBrowserMainParts::PostBrowserStart();
 
   base::PostDelayedTaskWithTraits(
-      FROM_HERE, base::TaskTraits().MayBlock().WithPriority(
-                     base::TaskPriority::BACKGROUND),
+      FROM_HERE, {base::MayBlock(), base::TaskPriority::BACKGROUND},
       base::Bind(&ReportSeccompSupport), base::TimeDelta::FromMinutes(1));
 
   RegisterChromeJavaMojoInterfaces();