Disable SecurityTest.NewOverflow under ThreadSanitizer v2

BUG=310631
TBR=jln@chromium.org

Review URL: https://codereview.chromium.org/38753005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230684 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230684