Change namespace from ui to gfx for NativePixmap related code

ui/ozone/platform/drm/gpu/gbm_surface_factory.h

Index: ui/ozone/platform/drm/gpu/gbm_surface_factory.h
diff --git a/ui/ozone/platform/drm/gpu/gbm_surface_factory.h b/ui/ozone/platform/drm/gpu/gbm_surface_factory.h
index 48f429c41ec1673bd45ece78fc7206140c9248ed..ce1abfdc26d146c5657ca044687c12e7b1d07af2 100644
--- a/ui/ozone/platform/drm/gpu/gbm_surface_factory.h
+++ b/ui/ozone/platform/drm/gpu/gbm_surface_factory.h
@@ -40,12 +40,12 @@ class GbmSurfaceFactory : public SurfaceFactoryOzone {
       gfx::AcceleratedWidget widget) override;
   std::unique_ptr<SurfaceOzoneCanvas> CreateCanvasForWidget(
       gfx::AcceleratedWidget widget) override;
-  scoped_refptr<ui::NativePixmap> CreateNativePixmap(
+  scoped_refptr<gfx::NativePixmap> CreateNativePixmap(
       gfx::AcceleratedWidget widget,
       gfx::Size size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage) override;
-  scoped_refptr<NativePixmap> CreateNativePixmapFromHandle(
+  scoped_refptr<gfx::NativePixmap> CreateNativePixmapFromHandle(
       gfx::AcceleratedWidget widget,
       gfx::Size size,
       gfx::BufferFormat format,