Remove dead SK_SUPPORT_LEGACY_PICTURESHADER_ROUNDING code

This flag is no longer used.

Change-Id: I239e756f7945f0848d12409f0eb8d3077651a4cf
Reviewed-on: https://skia-review.googlesource.com/62740
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed