It's not used.

R=gavinmak@google.com

Fixed: 1256920
Change-Id: Iffae29035839d553faa46149cd6d9eadfc6b2395
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3273328
Auto-Submit: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>