The patch 5a57246eab80 Rename String to StringUtils, but it didn't update the UPT Tool for the import statement which cause UPT tool break. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Yonghong Zhu <yonghong.zhu@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>