Use constexpr TaskTraits constructor in chromeos.

chromeos/dbus/lorgnette_manager_client.cc

Index: chromeos/dbus/lorgnette_manager_client.cc
diff --git a/chromeos/dbus/lorgnette_manager_client.cc b/chromeos/dbus/lorgnette_manager_client.cc
index 88f6934f984fba2fe09e894321cd9eca05b200f9..20e44622ed1e2de4d0ef887ff34f8d28d6b977ad 100644
--- a/chromeos/dbus/lorgnette_manager_client.cc
+++ b/chromeos/dbus/lorgnette_manager_client.cc
@@ -106,8 +106,8 @@ class LorgnetteManagerClientImpl : public LorgnetteManagerClient {
       CHECK(!pipe_reader_.get());
       pipe_reader_.reset(new chromeos::PipeReaderForString(
           base::CreateTaskRunnerWithTraits(
-              base::TaskTraits().MayBlock().WithShutdownBehavior(
-                  base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)),
+              {base::MayBlock(),
+               base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN}),
           base::Bind(&ScanToStringCompletion::OnScanToStringDataCompleted,
                      base::Unretained(this))));
       *fd = pipe_reader_->StartIO();