remove ClearVars() which was only
use by the constructor
instead initialize properly things in the constructor itself

Change-Id: I20a0ea26c5dce680844f81cf85ee72e1809a7068
Reviewed-on: https://gerrit.libreoffice.org/15890Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>