Seems overly verbose when run in "gclient runhooks".

R=iannucci@chromium.org, brettw@chromium.org

Review URL: https://codereview.chromium.org/58783002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@237120 0039d316-1c4b-4281-b951-d872f2087c98