479678 - Support HTTP/1.1 Upgrade in HttpClient.

Removed leftover code.

jetty-client/src/main/java/org/eclipse/jetty/client/http/HttpConnectionOverHTTP.java

@@ -90,13 +90,6 @@ public class HttpConnectionOverHTTP extends AbstractConnection implements Connec
         promise.succeeded(this);
     }
 
-    @Override
-    public void onClose()
-    {
-        softClose();
-        super.onClose();
-    }
-    
     public boolean isClosed()
     {
         return closed.get();