D25701: Use setIconProvider instead of setPixmapProvider for KHistoryComboBox

[Nicolas Fella]

nicolasfella added a task: T12310: Kill KUrlPixmapProvider.

REPOSITORY
  R135 Integration for Qt applications in Plasma

REVISION DETAIL
  https://phabricator.kde.org/D25701

To: nicolasfella, #plasma, #frameworks
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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