Remove cron.php entirely, as it is no longer necessary.

.htaccess

core/INSTALL.txt

core/cron.php

core/includes/bootstrap.inc

core/modules/aggregator/aggregator.test

core/modules/simpletest/drupal_web_test_case.php

core/modules/system/system.install

core/modules/system/system.module

core/modules/system/system.test

core/scripts/cron-curl.sh

core/scripts/cron-lynx.sh

core/scripts/drupal.sh