D18192: Remove unused forward declaration

[Dominik Haumann]

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

REPOSITORY
  R289 KNotifications

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D18192

To: vkrause, dhaumann
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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