Summary:
Those three classes where *used* inside of the SessionController
but they where not supposed to be there. The code in the
SessionController is already too big to understand, so the removal
of unrelated code is a good thing: it's now easier to reason
about those other three classes without having to deal with
the whole code that the SessionController has.
Reviewers: #konsole, hindenburg
Reviewed By: #konsole, hindenburg
Subscribers: konsole-devel
Tags: #konsole
Differential Revision: https://phabricator.kde.org/D17485
