sync: delete dummy builders_test file

The builders should be happy building errgroup instead now.

Change-Id: I99f549032f771e067b5f7780eba1cc6e91bbdfa5
Reviewed-on: https://go-review.googlesource.com/24962
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed
tree: 4f82021d2f6dd4f55db9298f1f421333ac478b04
  1. AUTHORS
  2. CONTRIBUTING.md
  3. CONTRIBUTORS
  4. LICENSE
  5. PATENTS
  6. README
  7. errgroup/