Added a convenience mechanism to delete the whole database if it is of
a version that is so old that the application does not want to support
upgrading it. SQLiteOpenHelper now automatically deletes such a database
and creates a fresh one with the newest version provided. A callback
onBeforeDelete is added if the application wants to collect some data
from the db before it is deleted.
Test: Tested by upgrading contacts database using ContactsDatabaseHelper
Bug: 31559016
Change-Id: I3f924d247cdca2015c4244cc987de2538a086651
6222176963