D4970: Get rid of QWeakPointer

[Denis Shienkov]

denisshienkov added a reviewer: volkov.

REPOSITORY
  R122 Powerdevil

REVISION DETAIL
  https://phabricator.kde.org/D4970

To: denisshienkov, volkov
Cc: plasma-devel, volkov, progwolff, lesliezhai, ali-mohamed, jensreuterberg, 
abetts, sebas, apol