Delete an unnecessary suppression for a glibc race that has been fixed long ago.

BUG=84726
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/149913003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248987 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 248987