Remove Sync and Scene functions from Renderer.

PiperOrigin-RevId: 828481721
Change-Id: Id0399139653b0ec27f0d365437e62cadefadfe6c

src/experimental/studio/main.cc

@@ -56,7 +56,6 @@ int main(int argc, char** argv, char** envp) {
   if (model_file.empty() && argc > 1 && argv[1][0] != '-') model_file = argv[1];
   app.LoadModel(model_file);
   while (app.Update()) {
-    app.Sync();
     app.BuildGui();
     app.Render();
   }