remove legacy switch

Chrome tests have been rebased
and legacy define has been removed,
so remove from Skia as well.

R=fmalita@chromium.org

Bug:843966
Change-Id: I3794b8457c581f71d4bd30eb81d6fa4c8a589cad
Reviewed-on: https://skia-review.googlesource.com/c/176224
Auto-Submit: Cary Clark <caryclark@skia.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
1 file changed