Revert of Use TaskScheduler instead of WorkerPool in gbm_surfaceless.cc.

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

Index: ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
diff --git a/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc b/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
index 132699aad592cc06b03895ce41785d655036eeaa..2fe3306e323c97594ca1fd7af49bbc1cdee3eba3 100644
--- a/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
@@ -9,7 +9,7 @@
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
-#include "base/task_scheduler/post_task.h"
+#include "base/threading/worker_pool.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/ozone/common/egl_util.h"
 #include "ui/ozone/platform/drm/gpu/drm_vsync_provider.h"
@@ -131,12 +131,8 @@
         base::Bind(&GbmSurfaceless::FenceRetired, weak_factory_.GetWeakPtr(),
                    fence, frame);
 
-    base::PostTaskWithTraitsAndReply(
-        FROM_HERE, base::TaskTraits()
-                       .WithShutdownBehavior(
-                           base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN)
-                       .MayBlock(),
-        fence_wait_task, fence_retired_callback);
+    base::WorkerPool::PostTaskAndReply(FROM_HERE, fence_wait_task,
+                                       fence_retired_callback, false);
     return;  // Defer frame submission until fence signals.
   }