I removed the deletes in the destructor in

    commit b27fee9e
    Date:   Wed Jan 10 11:44:28 2018 +0200
    loplugin:useuniqueptr cppu,idlc,io,ucbhelper

but forgot to do the actual conversion

Change-Id: Icb03070e1d8a2b10ccf892f01e9b44cc6bf0156f