D23377: Don't make CssHelperBase::extraXCss() methods virtual

[Sandro Knauß]

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

REPOSITORY
  R94 PIM: Message Library

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D23377

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