The command is used for verification purposes when git index is fetched
from GS. The output is verbose for chromium/src and not useful at all.

R=gavinmak@google.com

Bug: 1255228
Change-Id: Ie95963a23ef397e9fd6ce7bcf959ec9964d21ba7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3227145
Auto-Submit: Josip Sokcevic <sokcevic@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>