Remove heapcheck suppression for media_unittests.
Remove heapcheck suppression for media_unittests.

Fix for the leak was checked in as r75222.

Patch by sjl@chromium.org:
http://codereview.chromium.org/6538026/

BUG=73132
TEST=linux_valgrind try bot.

git-svn-id: http://src.chromium.org/svn/trunk/src@75309 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a36b74bb1e51ca11ace87cf321980e998b1ee273
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