Remove SK_SUPPORT_LEGACY_BACKEND_OBJECTS from public.bzl.

Bug: skia:
Change-Id: Ie8b874bfb53018c5a854eebafca41233281eaf4c
Reviewed-on: https://skia-review.googlesource.com/125753
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed