Fix ChromeOS build by #including needed header.
Fix ChromeOS build by #including needed header.

TBR=sky

Review URL: http://codereview.chromium.org/459012

git-svn-id: http://src.chromium.org/svn/trunk/src@33562 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f2ef1ae45f2665d78398d3391808c804ff547e07
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