Valgrind: Supress a small net unittest leak.
Valgrind: Supress a small net unittest leak.

BUG=57456
TEST=valgrind net_unittests goes green.
TBR=agl
Review URL: http://codereview.chromium.org/3585005

git-svn-id: http://src.chromium.org/svn/trunk/src@61105 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8e705ca280c30f5abcb6b6c2897eb64975a7a3b5
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