Remove (unused) SkSL::NodeArrayWrapper

Change-Id: Ibe3c3d27a112df8838bc86d6c2482277fdae62af
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/335821
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
4 files changed