Use constexpr TaskTraits constructor in device.

device/usb/usb_service.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "device/usb/usb_service.h"
 
 #include "base/bind.h"
 #include "base/feature_list.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
@@ skipping 48 matching lines @@
   return base::WrapUnique(new UsbServiceImpl());
 #else
   return nullptr;
 #endif
 }
 
 // static
 scoped_refptr<base::SequencedTaskRunner>
 UsbService::CreateBlockingTaskRunner() {
   return base::CreateSequencedTaskRunnerWithTraits(
-      base::TaskTraits()
-          .MayBlock()
-          .WithPriority(base::TaskPriority::USER_VISIBLE)
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN));
+      {base::MayBlock(), base::TaskPriority::USER_VISIBLE,
+       base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN});
 }
 
 UsbService::~UsbService() {
 #if DCHECK_IS_ON()
   DCHECK(did_shutdown_);
 #endif
   for (const auto& map_entry : devices_)
     map_entry.second->OnDisconnect();
   for (auto& observer : observer_list_)
     observer.WillDestroyUsbService();
@@ skipping 94 matching lines @@
   DCHECK(CalledOnValidThread());
 
   for (auto& observer : observer_list_)
     observer.OnDeviceRemoved(device);
   device->NotifyDeviceRemoved();
   for (auto& observer : observer_list_)
     observer.OnDeviceRemovedCleanup(device);
 }
 
 }  // namespace device