This was only used by DSL fragment processors and is unreferenced.
This removal causes the uniform-handle value in DSLVarBase to become
unreferenced as well.
Change-Id: Ifc89a3dda93f08c40341f654981bbb6593d4fb9f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/541745
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>