Remove unused private variables from DashOp

Change-Id: I83e61ddd0f141481b677e9682afcea6f7d29b841
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/717076
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed