git cl dcommit statistics were not using --find-copies-harder, scaring the user
off.

R=cmp@chromium.org
BUG=
TEST=


Review URL: https://chromiumcodereview.appspot.com/10795003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@147343 0039d316-1c4b-4281-b951-d872f2087c98