Revert "Workaround for Ketarin's google-chrome* jobs"

This reverts commit 43f618722209504a153252aa1f24e2796bcc9dbe.
Revert "Workaround for Cygwin's Ketarin job"

This reverts commit 0c650cb4b7de028c492f3889043b32ae4f235af7.
Use version variable as change indicator for chrome packages