Remove legacy guard flags

Bug: skia:
Change-Id: I3b526f2caec6766faea72cdc89550f50e17c71d2
Reviewed-on: https://skia-review.googlesource.com/125746
Reviewed-by: Cary Clark <caryclark@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Yuqian Li <liyuqian@google.com>
4 files changed