Searched source for using declarations. Checked if those symbols reappear in the source file, even in comments or dead code but not in #include statements. If they don't reappear, remove the declaration. Remove includes whose symbol got removed. Change-Id: Ibb77163f63c1120070e9518e3dc0a78c6c59fab0 Reviewed-on: https://gerrit.libreoffice.org/24148 Reviewed-by: Jochen Nitschke <j.nitschke+logerrit@ok.de> Reviewed-by: Noel Grandin <noelgrandin@gmail.com> Tested-by: Noel Grandin <noelgrandin@gmail.com>