Avoid DelStreamName because it can lead to image loss.
Avoid DelStreamName because it can lead to image loss.

See also:
f811e628411bda29a76ebb1f72eb107ce67d27f0

The problem is that more images can have the same stream name
so we can't decide here when to remove one stream name. Better
to leak in the storage as to loose images (actually we already
leak here, so)

Change-Id: I2c2afe87e024c2521fe22d62126b567931604101

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