D7409: Remove the entirely unused useCache property

[Volker Krause]

vkrause created this revision.
Restricted Application added a project: KDE PIM.

REPOSITORY
  R88 PIM: Gravatar Library

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7409

AFFECTED FILES
  autotests/gravatarresolvurljobtest.cpp
  src/job/gravatarresolvurljob.cpp
  src/job/gravatarresolvurljob.h

To: vkrause, #kde_pim
Cc: dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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