While I was in this code, I realized that the setVariable method of
InterfaceBlock was unused and there was therefore no reason to be
storing a pointer instead of a reference.
Bug: oss-fuzz:39000
Change-Id: If7505ba87f4060370cfd32ca2e30c76648965101
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/450446
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
