Fix memory leaks in media_bench.
Fix memory leaks in media_bench.

BUG=25855,25945
TEST=valgrind should report no leaks caused by media_bench itself

Review URL: http://codereview.chromium.org/332038


git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@30228 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser