Remove path length computation as it is not used and incorrect.

See http://www.vtk.org/Bug/view.php?id=13182

Change-Id: Iceb5eee8bf2d6f3523a7e045324ea70f0659fa4c
Merge topic '0013182_remove_unfinished_stub_code' into master

815c09a2 Remove path length computation as it is not used and incorrect.