Add a chromium version to policy template files.

CL by cschuet@chromium.org, reviewed at
https://codereview.chromium.org/631223003.

BUG=108941
TEST=python test_suite_all.py

Review URL: https://codereview.chromium.org/642443004

git-svn-id: http://grit-i18n.googlecode.com/svn/trunk@178 7262f16d-afe8-6277-6482-052fa10e57b1