am 73013bf9: Make LauncherModel.deleteItemFromDatabase write to disk async.

Merge commit '73013bf94f49ffbacba2b8300f6a2dd4eeebbd13'

* commit '73013bf94f49ffbacba2b8300f6a2dd4eeebbd13':
  Make LauncherModel.deleteItemFromDatabase write to disk async.