Use constexpr TaskTraits constructor in ui.

ui/ozone/platform/headless/headless_surface_factory.cc

Index: ui/ozone/platform/headless/headless_surface_factory.cc
diff --git a/ui/ozone/platform/headless/headless_surface_factory.cc b/ui/ozone/platform/headless/headless_surface_factory.cc
index 11b992569b7028c358045c6da0a9fabebabd0aa9..56f06819038778745498c3e9855e7d1660628f81 100644
--- a/ui/ozone/platform/headless/headless_surface_factory.cc
+++ b/ui/ozone/platform/headless/headless_surface_factory.cc
@@ -55,10 +55,8 @@ class FileSurface : public SurfaceOzoneCanvas {
     // See crbug.com/361605 for details.
     if (surface_->getCanvas()->readPixels(bitmap, 0, 0)) {
       base::PostTaskWithTraits(
-          FROM_HERE, base::TaskTraits()
-                         .WithShutdownBehavior(
-                             base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                         .MayBlock(),
+          FROM_HERE,
+          {base::MayBlock(), base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN},
           base::Bind(&WriteDataToFile, location_, bitmap));
     }
   }