valgrind: Update the signature for a mac suppression.
valgrind: Update the signature for a mac suppression.

BUG=none
TEST=Webkit Mac (valgrind) goes green.
TBR=stuartmorgan
Review URL: http://codereview.chromium.org/2804021

git-svn-id: http://src.chromium.org/svn/trunk/src@50703 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 9af94bc82660e9898edd09d38708b1731d1e1ccf
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