java: Address several TODOs related to blessings

The changes are the following:

 - the sSelfAndCloud is not a function to allow the blessings to
   change

 - the getPersonalBlessingString now calls UserBlessingFromContext()
   instead of using '...'.

 - the database() now calls AppBlessingFromContext() instead of using
   '...'.

Thanks to zinman to point out most of the above.

Change-Id: I7213ae33d9537fe596b121460b2247d79ef80166
2 files changed