Fix null-pointer crash.
Fix null-pointer crash.

BUG=29444

Review URL: http://codereview.chromium.org/469001

git-svn-id: http://src.chromium.org/svn/trunk/src@33914 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f1d966121aeecda079cd18ef987fcbd8a708280b
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