improve java.sql.Wrapper support

src/main/java/com/alibaba/druid/pool/DruidPooledResultSet.java

@@ -33,8 +33,6 @@ import java.sql.SQLXML;
 import java.sql.Statement;
 import java.util.Calendar;
 
-import com.alibaba.druid.proxy.jdbc.ResultSetProxy;
-
 /**
  * @author wenshao<szujobs@hotmail.com>
  */
@@ -1772,17 +1770,4 @@ public final class DruidPooledResultSet extends PoolableWrapper implements Resul
     public <T> T getObject(String columnLabel, Class<T> type) throws SQLException {
         throw new SQLFeatureNotSupportedException();
     }
-    
-    @SuppressWarnings("unchecked")
-    public <T> T unwrap(Class<T> iface) throws SQLException {
-        if (iface == ResultSet.class) {
-            if (rs instanceof ResultSetProxy) {
-                return rs.unwrap(iface);
-            }
-            
-            return (T) rs;
-        }
-        
-        return super.unwrap(iface);
-    }
 }