Revert patch r104923. This patch doesn't actually fix bug 18757 and

breaks TLS upgrade functionality.  Also, removing the content length for
HEAD requests is being handled in ap_http_header_filter().


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@110141 13f79535-47bb-0310-9956-ffa450edef68