Delete bundled copy of NSS and replace with README. We are no longer maintaining this repository and keeping it up-to-date for security fixes. It must not be used. BUG=none R=rsleevi@chromium.org Review URL: https://codereview.chromium.org/2078763002 .
Chromium no longer bundles NSS and has instead moved to BoringSSL. As a result, this repository is unmaintained. It should not be used.
Note: Although, as of writing, the Linux and Chromium OS ports of Chromium do use a system copy NSS for certificate verification, that has never used this repository.