views: Make SubmenuView::PaintChildren use the canvas via PaintRecorder

ui/views/controls/menu/submenu_view.h

Index: ui/views/controls/menu/submenu_view.h
diff --git a/ui/views/controls/menu/submenu_view.h b/ui/views/controls/menu/submenu_view.h
index 6f02d7e173a908c1f5a87f24841a2c6bd96226c7..d2aebf81c0efb8766840d97157994a0da7fb8c6b 100644
--- a/ui/views/controls/menu/submenu_view.h
+++ b/ui/views/controls/menu/submenu_view.h
@@ -166,12 +166,6 @@ class VIEWS_EXPORT SubmenuView : public PrefixDelegate,
   void ChildPreferredSizeChanged(View* child) override;
 
  private:
-  // Paints the drop indicator. This is only invoked if item is non-NULL and
-  // position is not DROP_NONE.
-  void PaintDropIndicator(gfx::Canvas* canvas,
-                          MenuItemView* item,
-                          MenuDelegate::DropPosition position);
-
   void SchedulePaintForDropIndicator(MenuItemView* item,
                                      MenuDelegate::DropPosition position);