Remove (unused) gpuType from SkRuntimeEffect::Uniform

Also remove some unnecessary includes, then IWYU.

Change-Id: I41e88f0e661c59e75cb26e28768801b811fe8ee8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/371140
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
3 files changed