Fix broken Memcheck suppressions: invalid mangled names

TBR=tfarina@chromium.org, rdevlin.cronin@chromium.org
BUG=

Review URL: https://codereview.chromium.org/117943002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241592 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241592