[Mac] Modify existing suppression to silence valgrind leak warning
[Mac] Modify existing suppression to silence valgrind leak warning

Existing suppression no longer works due to code changes in r46331.

TEST=builds less red
BUG=20504

Review URL: http://codereview.chromium.org/1933003

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@46342 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