Avoiding deleting the removed entry.
Avoiding deleting the removed entry.

The tree list entries are now stored in ptr_vector. We no longer
have to manually call delete on it whenever it gets removed from the
list.

Change-Id: Id183aadbdc3b1565d1c702dc0fc099df9dcb6e2c

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