loplugin:redundantcast: const_cast to same type
loplugin:redundantcast: const_cast to same type

Change-Id: I1abdc2ab0b145e12f7fb00db529f52c11e4d7cfd

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