[sqlite3] remove some dead code in our copy
[sqlite3] remove some dead code in our copy

While the module is supposed to be a close copy of the AR class,
this code is just dead...and worse, confusing

kares/activerecord-jdbc-adapter,bruceadams/activerecord-jdbc-adapter,jruby/activerecord-jdbc-adapter,jruby/activerecord-jdbc-adapter,bruceadams/activerecord-jdbc-adapter,bruceadams/activerecord-jdbc-adapter,jruby/activerecord-jdbc-adapter,kares/activerecord-jdbc-adapter,kares/activerecord-jdbc-adapter