D25858: Use QStyle for determining icon sizes

[Aleix Pol Gonzalez]

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

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D25858

To: vkrause, apol
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns