`DefNewGeneration::ref_processor_init` just calls the method it's overriding.
```
void DefNewGeneration::ref_processor_init() {
Generation::ref_processor_init();
}
```
One can remove it and mark Generation::ref_processor_init as non-virtual.
```
void DefNewGeneration::ref_processor_init() {
Generation::ref_processor_init();
}
```
One can remove it and mark Generation::ref_processor_init as non-virtual.