SkQP: remove unit tests BUG=skqp:7695 Change-Id: Ifd87db5781542f1f1d37dd540420cf9fbaff37de Reviewed-on: https://skia-review.googlesource.com/112844 Reviewed-by: Greg Daniel <egdaniel@google.com> Commit-Queue: Hal Canary <halcanary@google.com>