remove unused class
remove unused class

wangjun/open-slideshare,wangjun/open-slideshare,ryuzee/open-slideshare,jaambee/open-slideshare,ryuzee/open-slideshare,ryuzee/open-slideshare,jaambee/open-slideshare,wangjun/open-slideshare,jaambee/open-slideshare