port gcr-import-button to newer GTK+ API
When compiling it you will see:
ui/gcr-import-button.c: In function 'on_menu_position':
ui/gcr-import-button.c:434:2: warning: 'gdk_screen_get_monitor_at_window' is deprecated: Use 'gdk_display_get_monitor_at_window' instead [-Wdeprecated-declarations]
...
It would be good to port it to the newer API as suggested.