ScreenOrientation enum is changed to enum class.
ScreenOrientation enum is changed to enum class.

Change-Id: I435168cda19af00e2cc5e34f50d853f2f9c0bfcc

WonyoungChoi/crosswalk-tizen,psikorski/crosswalk-tizen,psikorski/crosswalk-tizen,myroot/crosswalk-tizen,psikorski/crosswalk-tizen,myroot/crosswalk-tizen,sung-su/crosswalk-tizen,myroot/crosswalk-tizen,hgl888/crosswalk-tizen,hgl888/crosswalk-tizen,YongseopKim/crosswalk-tizen,YongseopKim/crosswalk-tizen,WonyoungChoi/crosswalk-tizen,WonyoungChoi/crosswalk-tizen,hgl888/crosswalk-tizen,WonyoungChoi/crosswalk-tizen,sung-su/crosswalk-tizen,sung-su/crosswalk-tizen,psikorski/crosswalk-tizen,myroot/crosswalk-tizen,hgl888/crosswalk-tizen,YongseopKim/crosswalk-tizen,sung-su/crosswalk-tizen,YongseopKim/crosswalk-tizen