LibCore: Don't implement pure virtual methods in NetworkJob

Author: https://github.com/LucasChollet
Commit: 5fc873f53b
Pull-request: https://github.com/SerenityOS/serenity/pull/19764
Reviewed-by: https://github.com/alimpfard ✅
Reviewed-by: https://github.com/gmta ✅
Reviewed-by: https://github.com/shannonbooth

Userland/Libraries/LibCore/NetworkJob.cpp

@@ -16,14 +16,6 @@ NetworkJob::NetworkJob(Stream& output_stream)
 {
 }
 
-void NetworkJob::start(Core::Socket&)
-{
-}
-
-void NetworkJob::shutdown(ShutdownMode)
-{
-}
-
 void NetworkJob::did_finish(NonnullRefPtr<NetworkResponse>&& response)
 {
     if (is_cancelled())