Related to #8327
Deleting doesn't seem to do anything still, but at least doesn't throw an exception.
Also removed behavior of dismissing notification after sharing/deleting pages/backups
in case you want to do something again afterwards. Users can manually dismiss the
notification whenever they want.
(cherry picked from commit 1f259f92986c3e4c86d6068eec257f6bd32f69b4)
c588922b0b