Tweak a valgrind suppression so it actually works.
Tweak a valgrind suppression so it actually works.

BUG=28179
TEST=valgrind bot goes green.
TBR=tony
Review URL: http://codereview.chromium.org/406008

git-svn-id: http://src.chromium.org/svn/trunk/src@32432 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c17ea28435525a9497737c0537d850e156356b13
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