Fix bug #2519159 (com.android.providers.calendar.CalendarProvider2Test:testChangeTimezoneDB is failing)

- update visibility for method getTimezoneDatabaseVersion()
- update CalendarProvider2 make file (add guava) and clean tests make files

Change-Id: I61a0f1a8fb164e6f28137eb816555b3a96dc8a80
3 files changed