Use constexpr TaskTraits constructor in ui.

ui/ozone/platform/drm/gpu/gbm_surfaceless.cc

 // Copyright 2016 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 "ui/ozone/platform/drm/gpu/gbm_surfaceless.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 110 matching lines @@
   }
 
   base::Closure fence_wait_task =
       base::Bind(&WaitForFence, GetDisplay(), fence);
 
   base::Closure fence_retired_callback = base::Bind(
       &GbmSurfaceless::FenceRetired, weak_factory_.GetWeakPtr(), fence, frame);
 
   base::PostTaskWithTraitsAndReply(
       FROM_HERE,
-      base::TaskTraits()
-          .WithShutdownBehavior(
-              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-          .MayBlock(),
+      {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
       fence_wait_task, fence_retired_callback);
 }
 
 void GbmSurfaceless::PostSubBufferAsync(
     int x,
     int y,
     int width,
     int height,
     const SwapCompletionCallback& callback) {
   // The actual sub buffer handling is handled at higher layers.
@@ skipping 84 matching lines @@
   swap_buffers_pending_ = false;
   if (result == gfx::SwapResult::SWAP_FAILED) {
     last_swap_buffers_result_ = false;
     return;
   }
 
   SubmitFrame();
 }
 
 }  // namespace ui