We don't need this any more.
We don't need this any more.

This was used when external references used hidden sheets as a cheesy
workaround.

Change-Id: I7e4bf3a2235a0c2e80d0aa71a81f22a10b8d0fd5

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