Use constexpr TaskTraits constructor in chrome.

chrome/browser/google/google_brand_chromeos.cc

Index: chrome/browser/google/google_brand_chromeos.cc
diff --git a/chrome/browser/google/google_brand_chromeos.cc b/chrome/browser/google/google_brand_chromeos.cc
index 58cd28beb983540229bfd1a9c454840a0ff9557c..bbe53db2da2b76bd6435635e6fddff0c8538b9e5 100644
--- a/chrome/browser/google/google_brand_chromeos.cc
+++ b/chrome/browser/google/google_brand_chromeos.cc
@@ -75,11 +75,9 @@ void InitBrand(const base::Closure& callback) {
   }
 
   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(&ReadBrandFromFile), base::Bind(&SetBrand, callback));
 }