D15301: Use std::unique_ptr for two private data members

[Oliver Sander]

sander marked an inline comment as done.

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D15301

To: sander, #okular
Cc: tobiasdeiminger, okular-devel, ngraham, aacid
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