Follow-up to ilevy's comments in https://chromiumcodereview.appspot.com/14759006/

Review URL: https://chromiumcodereview.appspot.com/14874005

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@198236 0039d316-1c4b-4281-b951-d872f2087c98