Add lss to the list of special cases in tools/licenses.py.
Add lss to the list of special cases in tools/licenses.py.

BUG=57845
TEST=licenses.py stops complaining about third_party/lss.
Review URL: http://codereview.chromium.org/3563007

git-svn-id: http://src.chromium.org/svn/trunk/src@61538 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 380e8368d916113e0fe262550b923c0ae2c23a6b
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser