remove unused method

engine.go

@@ -1583,8 +1583,3 @@ func (engine *Engine) BufferSize(size int) *Session {
 	session.isAutoClose = true
 	return session.BufferSize(size)
 }
-
-//Stats return the number of open connections to the database
-func (engine *Engine) Stats() int {
-	return engine.DB().Stats().OpenConnections
-}

engine_group_policy.go

@@ -135,7 +135,7 @@ func (policy *LeastConnPolicy) Slave(g *EngineGroup) *Engine {
 	connections := 0
 	idx := 0
 	for i, _ := range slaves {
-		open_connections := slaves[i].Stats()
+		open_connections := slaves[i].DB().Stats().OpenConnections
 		if i == 0 {
 			connections = open_connections
 			idx = i