It looks like this regressed when we switched from specifying CCs
via the refspec arguments to using the API.

BUG=680605

Change-Id: Iabd397b639989f050932188b1a1aa488639ffbbe
Reviewed-on: https://chromium-review.googlesource.com/427344Reviewed-by: Andrew Bonventre <andybons@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Aaron Gable <agable@chromium.org>