Always use the LocalePicker's preferred locale names.

Always use the LocalePicker's preferred locale names.

Without this change we have the odd situation where LocalePicker goes out of
its way to avoid saying certain things but then -- as long as there's more than
one locale for a given language -- Settings would happily report the name we'd
been avoiding. (Either because it's too specific or because it's too sensitive.)

Also remove the unused bit-rotted duplicate of the blacklist; even if we needed
to access that list directly, we should use LocalePicker's copy.

Bug: 17150708
Change-Id: I9bfa0bf9a82bebd29ba45f4cbeaabb4e78570779