connection_basic: remove unused floating time start time

contrib/epee/include/net/connection_basic.hpp

@@ -92,7 +92,6 @@ class connection_basic { // not-templated base class for rapid developmet of som
     critical_section m_send_que_lock;
     std::list<std::string> m_send_que;
     volatile bool m_is_multithreaded;
-    double m_start_time;
     /// Strand to ensure the connection's handlers are not called concurrently.
     boost::asio::io_service::strand strand_;
     /// Socket for the connection.
@@ -112,8 +111,6 @@ class connection_basic { // not-templated base class for rapid developmet of som
 		void logger_handle_net_write(size_t size); // network data written
 		void logger_handle_net_read(size_t size); // network data read
 
-		void set_start_time();
-
 		// config for rate limit
 		
 		static void set_rate_up_limit(uint64_t limit);

contrib/epee/src/connection_basic.cpp

@@ -250,22 +250,15 @@ void connection_basic::sleep_before_packet(size_t packet_size, int phase,  int q
 	}
 
 }
-void connection_basic::set_start_time() {
-	CRITICAL_REGION_LOCAL(	network_throttle_manager::m_lock_get_global_throttle_out );
-	m_start_time = network_throttle_manager::get_global_throttle_out().get_time_seconds();
-}
 
 void connection_basic::do_send_handler_write(const void* ptr , size_t cb ) {
         // No sleeping here; sleeping is done once and for all in connection<t_protocol_handler>::handle_write
 	MTRACE("handler_write (direct) - before ASIO write, for packet="<<cb<<" B (after sleep)");
-	set_start_time();
 }
 
 void connection_basic::do_send_handler_write_from_queue( const boost::system::error_code& e, size_t cb, int q_len ) {
         // No sleeping here; sleeping is done once and for all in connection<t_protocol_handler>::handle_write
 	MTRACE("handler_write (after write, from queue="<<q_len<<") - before ASIO write, for packet="<<cb<<" B (after sleep)");
-
-	set_start_time();
 }
 
 void connection_basic::logger_handle_net_read(size_t size) { // network data read