Use constexpr TaskTraits constructor in components.

components/nacl/browser/nacl_host_message_filter.cc

Index: components/nacl/browser/nacl_host_message_filter.cc
diff --git a/components/nacl/browser/nacl_host_message_filter.cc b/components/nacl/browser/nacl_host_message_filter.cc
index a3125a7bcb6f6b061c834f6127a044bf0718d31d..9089e7a554942e2feb61dd11474848f8d02e934d 100644
--- a/components/nacl/browser/nacl_host_message_filter.cc
+++ b/components/nacl/browser/nacl_host_message_filter.cc
@@ -196,10 +196,8 @@ void NaClHostMessageFilter::LaunchNaClContinuation(
   // |launch_params.resource_files_to_prefetch|.
   base::PostTaskWithTraits(
       FROM_HERE,
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::USER_BLOCKING)
-          .WithShutdownBehavior(base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN),
+      {base::MayBlock(), base::TaskPriority::USER_BLOCKING,
+       base::TaskShutdownBehavior::SKIP_ON_SHUTDOWN},
       base::Bind(&NaClHostMessageFilter::BatchOpenResourceFiles, this,
                  safe_launch_params, reply_msg, permissions));
 }