D10829: Use DocumentId class

[Michael Heidelbach]

michaelh added a dependent revision: D10856: Make tests compile, except one.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D10829

To: michaelh, adridg, #baloo, #frameworks
Cc: alexeymin, ashaposhnikov, michaelh, spoorun, nicolasfella
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