Substitute HttpIoCharToUpper with AsciiCharToUpper which is a public function with the same effect. And remove the implement of HttpIoCharToUpper. https://bugzilla.tianocore.org/show_bug.cgi?id=1369 Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Hao Wu <hao.a.wu@intel.com> Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Ray Ni <ray.ni@intel.com>