Remove unused variable from Util class.
Remove unused variable from Util class.

palaniyappanBala/MobFox-Android-SDK,aiurlano/MobFox-Android-SDK,MeiCassieDong/test,aiurlano/MobFox-Android-SDK,MaTriXy/MobFox-Android-SDK,palaniyappanBala/MobFox-Android-SDK,MaTriXy/MobFox-Android-SDK,aiurlano/MobFox-Android-SDK,palaniyappanBala/MobFox-Android-SDK,MaTriXy/MobFox-Android-SDK