Implements hook_uninstall().
function statistics_uninstall() {
// Remove variables.
variable_del('statistics_count_content_views');
variable_del('statistics_count_content_views_ajax');
variable_del('statistics_enable_access_log');
variable_del('statistics_flush_accesslog_timer');
variable_del('statistics_day_timestamp');
variable_del('statistics_block_top_day_num');
variable_del('statistics_block_top_all_num');
variable_del('statistics_block_top_last_num');
}