remove min from repeat and mirror generally

I don't think they do anything anymore after the inclusive/exclusive
refactoring.

Change-Id: I63f2e010a00953b5b6415de002bcb51ec2b73458
Reviewed-on: https://skia-review.googlesource.com/17490
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Herb Derby <herb@google.com>
3 files changed