Revert of Adding status to swap complete

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 244b8abcfa2bb8ebb089f621430185ab20b7b06c..c906cfde113adc0a99724e1c93f3a851e9e311f2 100644
--- a/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
@@ -14,10 +14,6 @@
 #include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
 
 namespace ui {
-namespace {
-void EmptyPageFlipCallback(gfx::SwapResult result) {
-}
-}  // namespace
 
 GbmSurfaceless::GbmSurfaceless(DrmWindow* window_delegate,
                                DrmDeviceManager* drm_device_manager)
@@ -39,7 +35,7 @@
 
 bool GbmSurfaceless::OnSwapBuffers() {
   return window_delegate_->SchedulePageFlip(true /* is_sync */,
-                                            base::Bind(&EmptyPageFlipCallback));
+                                            base::Bind(&base::DoNothing));
 }
 
 bool GbmSurfaceless::OnSwapBuffersAsync(