rails/rails — pull request #6709 by amatsuda (2012-06-11 20:04:05+00:00)
Title: current AR::ConnectionAdapters::SQLite3Adapter supports only SQLite3 ~> 1.3.6

So this condition is no more needed now.

See: https://github.com/rails/rails/blob/master/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb#L5