Remove useless comments and header, and de duplicate a small declaration.

Change-Id: I0d4475cbbd61ea964f8e586cf0e1f68eb91c4948
Reviewed-on: https://gerrit.libreoffice.org/6016Reviewed-by: Arnaud Versini <arnaud.versini@libreoffice.org>
Tested-by: Arnaud Versini <arnaud.versini@libreoffice.org>