Otherwise it's painful when using tricks like $(git cl upstream).

R=sky@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/6727012

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@79084 0039d316-1c4b-4281-b951-d872f2087c98