D20325: Remove deprecated and unused deletion notification methods

[Daniel Vrátil]

dvratil accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R172 KCalendar Core

BRANCH
  run3

REVISION DETAIL
  https://phabricator.kde.org/D20325

To: vkrause, dvratil
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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