As part of last year's refactoring, we replaced ext.centralNotice.bannerController and ext.centralNotice.bannerController.mobile with ext.centralNotice.startUp. However, we never actually stopped adding the old modules to page HTML; instead, they were added as empty modules, with the new code as dependencies.
To simplify some minor code changes suggested by other teams, it would be useful to finally move forward with this simple change, and stop adding the old modules. One month after that (once all the Varnish cache clears) we should be able to fully remove their declarations from the code.