Valgrind: Suppress a weird error on the CroS bots.
Valgrind: Suppress a weird error on the CroS bots.

BUG=43451
TEST=CrOS Valgrind 4 goes green.
Review URL: http://codereview.chromium.org/2010003

git-svn-id: http://src.chromium.org/svn/trunk/src@46605 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 7db27a09da29fbe8facc75d50e8eecb1d7743b65
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