Refactor app list max folder logic.

ui/app_list/views/apps_grid_view.h

Index: ui/app_list/views/apps_grid_view.h
diff --git a/ui/app_list/views/apps_grid_view.h b/ui/app_list/views/apps_grid_view.h
index 878ebd3442dc305cda5a593b39405da8b9f43259..de3d97ab57d096891a55884d3dac430a09621c2d 100644
--- a/ui/app_list/views/apps_grid_view.h
+++ b/ui/app_list/views/apps_grid_view.h
@@ -401,10 +401,6 @@ class APP_LIST_EXPORT AppsGridView : public views::View,
   // Whether the folder drag-and-drop UI should be enabled.
   bool EnableFolderDragDropUI();
 
-  // Whether target specified by |drap_target| can accept more items to be
-  // dropped into it.
-  bool CanDropIntoTarget(const Index& drop_target) const;
-
   // Returns the size of the entire tile grid.
   gfx::Size GetTileGridSize() const;