Function webkit2gtk_sys::webkit_user_content_filter_store_save

pub unsafe extern "C" fn webkit_user_content_filter_store_save(
    store: *mut WebKitUserContentFilterStore,
    identifier: *const c_char,
    source: *mut GBytes,
    cancellable: *mut GCancellable,
    callback: GAsyncReadyCallback,
    user_data: gpointer
)

Available on crate feature v2_24 only.