Add a header guard missing from previous patch.
Add a header guard missing from previous patch.

BUG=none
TEST=none.

Review URL: http://codereview.chromium.org/3372006

git-svn-id: http://src.chromium.org/svn/trunk/src@59037 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8d99ba47d3dd443a3e898e19273e54587010e2c5
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