recipe_engine:
  https://crrev.com/7e953fd1856282691c74d0b32791e2cdd090803e [recipe_engine] Fix autoroll json output. (iannucci@chromium.org)

TBR=martiniss@chromium.org

Bug: 914992
Change-Id: Ib89c8617ced568fe1a1ab423c219c4baa63cef32
Reviewed-on: https://chromium-review.googlesource.com/c/1476373Reviewed-by: Robbie Iannucci <iannucci@chromium.org>