GridWindow: use unique_ptr for filter box and float

Change-Id: Iaf203682e6d3b18d8b25c6ee2755710615fe5f08

sc/source/ui/inc/gridwin.hxx

@@ -137,8 +137,8 @@ class ScGridWindow : public vcl::Window, public DropTargetHelper, public DragSou
 
     ScNoteMarker*           pNoteMarker;
 
-    ScFilterListBox*        pFilterBox;
-    FloatingWindow*         pFilterFloat;
+    std::unique_ptr<ScFilterListBox> mpFilterBox;
+    std::unique_ptr<FloatingWindow> mpFilterFloat;
     boost::scoped_ptr<ScCheckListMenuWindow> mpAutoFilterPopup;
     boost::scoped_ptr<ScCheckListMenuWindow> mpDPFieldPopup;
     boost::scoped_ptr<ScDPFieldButton>       mpFilterButton;