remove unused flags -- no clients define these

Bug: skia:
Change-Id: Ibd50082a526827a0e01476798a1e1b964ee7bea4
Reviewed-on: https://skia-review.googlesource.com/c/163781
Commit-Queue: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed