Simplify ping/pong based heartbeat implementation

ixcobra/ixcobra/IXCobraConnection.cpp

@@ -270,10 +270,6 @@ namespace ix
         // This should keep the connection open and prevent some load balancers such as
         // the Amazon one from shutting it down
         _webSocket->setPingInterval(kPingIntervalSecs);
-
-        // If we don't receive a pong back, declare loss after 3 * N seconds
-        // (will be 90s now), and close and restart the connection
-        _webSocket->setPingTimeout(3 * kPingIntervalSecs);
     }
 
     void CobraConnection::configure(const ix::CobraConfig& config)