Try not to leak removed cell instances.
Try not to leak removed cell instances.

Change-Id: I25da4a34a3e53bc001519194729e613eef167713

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