Where is ‘audioservice.java"?

I know the file audioservice.java contains the code that I need modify (‘ro.config.media_vol_steps’ property) but I can’t find it anywhere on my android 10 device. In fact using ADB ‘find -name "*.java" tells me the only java files on my entire device tree are in the Spotify folder!

Is audioservice.java located on earlier android devices or has it been deprecated?

There is literally only googleSource that shows info on this but even the breadcrumbs don’t match anywhere on my device. I am truly lost on this one. Can someone please shed some light on this?