remove unused EXCHG_SOURCE_ constants
remove unused EXCHG_SOURCE_ constants

Change-Id: Ic2391f4da06e26ee11a2463d2508b0dccdbf52bd

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