Function webkit2gtk_sys::webkit_website_data_manager_get_itp_summary_finish

pub unsafe extern "C" fn webkit_website_data_manager_get_itp_summary_finish(
    manager: *mut WebKitWebsiteDataManager, 
    result: *mut GAsyncResult, 
    error: *mut *mut GError
) -> *mut GList

This is supported on crate feature v2_30 only.