Those built-in System Apps removers are not working (at least for me) - they are doing "something", but after reboot app isn't removed. I use "Lucky Patcher" for this.
Lucky Patcher:
http://www109.zippyshare.com/v/do2uddRc/file.html
How to use:
1) Open app XD
2) Grant root access
3) Go to "Settings" -> "Filter" -> tick "Show system apps"
4) Go back to main app screen
5) Tap on app You want to delete
6) (#OptionalButRecommended) Tap on "Clear data"
7) Tap on "Uninstall app"
This app has more features, not only the one described above. Tap & hold on app to get access to more options. Also there are tabs at the bottom with usefull features (ADBlocker!!!!! xD). Learn it & You will definetely love it!