Remove inherited program element list (it's now unused)

Change-Id: I82d4aaf442be262ad8e397de4f820831f4797b95
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/323977
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
4 files changed