Suppress another valgrind error.
Suppress another valgrind error.

BUG=28200
TEST=Tree goes green?
Review URL: http://codereview.chromium.org/402076

git-svn-id: http://src.chromium.org/svn/trunk/src@32456 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f58f150822bd9deae4e5ebd96574f3541d8a7fd6
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