remove unused HelpDownload
remove unused HelpDownload

Change-Id: Ib9e8a9a80498ad87df6ab13ded1127d068913347

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core