Make default SkUserConfig a noop

Change-Id: Ica7d62c758558c0e2c7bea9da8a08f25d1cfaeed
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209805
Commit-Queue: Hal Canary <halcanary@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Hal Canary <halcanary@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed