remove unused/unneeded stuff from gtk/private.h

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50231 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/window.cpp

@@ -4271,17 +4271,6 @@ wxPoint wxGetMousePosition()
 
 }
 
-// Needed for implementing e.g. combobox on wxGTK within a modal dialog.
-void wxAddGrab(wxWindow* window)
-{
-    gtk_grab_add( (GtkWidget*) window->GetHandle() );
-}
-
-void wxRemoveGrab(wxWindow* window)
-{
-    gtk_grab_remove( (GtkWidget*) window->GetHandle() );
-}
-
 GdkWindow* wxWindowGTK::GTKGetDrawingWindow() const
 {
     GdkWindow* window = NULL;