D25561: Remove unused signal we can use directly "signal(const QUrl&)

[Laurent Montel]

mlaurent added reviewers: dfaure, kossebau.

REPOSITORY
  R236 KWidgetsAddons

REVISION DETAIL
  https://phabricator.kde.org/D25561

To: mlaurent, dfaure, kossebau
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns