Fix crash caused by DCHECK for unmanaged ChromeOS devices.
Fix crash caused by DCHECK for unmanaged ChromeOS devices.

BUG=chromium-os:12571
TEST=Chrome no longer crashes on ChromeOS login.

Review URL: http://codereview.chromium.org/6592039

git-svn-id: http://src.chromium.org/svn/trunk/src@76533 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6c54e635e1eca4f86203d2dde6e5ad78a0b1f0c3
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