Revert "Fix make_shared using the wrong strand type"

websocketpp/transport/asio/connection.hpp

@@ -439,7 +439,7 @@ protected:
         m_io_service = io_service;
 
         if (config::enable_multithreading) {
-            m_strand = lib::make_shared<lib::asio::io_service::strand>(
+            m_strand = lib::make_shared<lib::asio::strand>(
                 lib::ref(*io_service));
 
             m_async_read_handler = m_strand->wrap(lib::bind(