Add suppression for mac test leak.
Add suppression for mac test leak.

TBR=maruel
BUG=39342
TEST=none

Review URL: http://codereview.chromium.org/1362001

git-svn-id: http://src.chromium.org/svn/trunk/src@42658 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c853f10df64e62b496a0d50e5347c56ef5c2c0c4
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