Pass Database to new UndoLog()

h2/src/main/org/h2/engine/Session.java

@@ -916,7 +916,7 @@ public class Session extends SessionWithState implements TransactionStore.Rollba
                 }
             }
             if (undoLog == null) {
-                undoLog = new UndoLog(this);
+                undoLog = new UndoLog(database);
             }
             undoLog.add(log);
         }

h2/src/main/org/h2/engine/UndoLog.java

@@ -30,10 +30,10 @@ public class UndoLog {
     /**
      * Create a new undo log for the given session.
      *
-     * @param session the session
+     * @param database the database
      */
-    UndoLog(Session session) {
-        this.database = session.getDatabase();
+    UndoLog(Database database) {
+        this.database = database;
     }
 
     /**