Add checkout.google.com to STS list, with permission from Checkout team.
Add checkout.google.com to STS list, with permission from Checkout team.

BUG=NONE
TEST=NONE

Review URL: http://codereview.chromium.org/6299020

git-svn-id: http://src.chromium.org/svn/trunk/src@72925 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: bc622bdec12bd46a2e36a52fe37bd9cd2fdf7264
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