did "restrict background data" *per-app* just disappear in an os update? (android 4.2.2)
The option is "Restrict Background Data" and you can access it on Settings -> Power Saving, after choosing a proper power saving mode. 

To stop Google Play from hogging your data, open the Google Play app settings and look at the "Auto-update apps" option. There is a possibility to only update when connected to an wifi network.