Use constexpr TaskTraits constructor in chrome.

chrome/browser/chromeos/login/session/user_session_manager.cc

Index: chrome/browser/chromeos/login/session/user_session_manager.cc
diff --git a/chrome/browser/chromeos/login/session/user_session_manager.cc b/chrome/browser/chromeos/login/session/user_session_manager.cc
index 2fb4573ccc75ed71ff2ea96e56e6af30513d72e1..007699c5b583ea30ed10328b7881e959d00e005d 100644
--- a/chrome/browser/chromeos/login/session/user_session_manager.cc
+++ b/chrome/browser/chromeos/login/session/user_session_manager.cc
@@ -597,11 +597,9 @@ void UserSessionManager::InitRlz(Profile* profile) {
     return;
   }
   base::PostTaskWithTraitsAndReplyWithResult(
-      FROM_HERE, base::TaskTraits()
-                     .WithShutdownBehavior(
-                         base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                     .WithPriority(base::TaskPriority::BACKGROUND)
-                     .MayBlock(),
+      FROM_HERE,
+      {base::MayBlock(), base::TaskPriority::BACKGROUND,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       base::Bind(&base::PathExists, GetRlzDisabledFlagPath()),
       base::Bind(&UserSessionManager::InitRlzImpl, AsWeakPtr(), profile));
 #endif