Add a suppression for the Mac Valgrind test_shell_test leak.
Add a suppression for the Mac Valgrind test_shell_test leak.

BUG=12571
Review URL: http://codereview.chromium.org/115739

git-svn-id: http://src.chromium.org/svn/trunk/src@16844 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6307fec8775137201d027210a31dc72fa82c6d10
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