Fix lookup key generation for inserted profiles.

We were properly updating the lookup key to "profile" on updates,
but the initial insert would still have a regular lookup key, which
would prevent us from identifying it as a profile URI, and in turn
meant that stream items wouldn't show up for the profile.

Bug 5245109

Change-Id: I7c01d051a167214be77bd962901af6cdb6100787
3 files changed