Update nss_revision to 243121.

Include the following changes:

Export CERT_DistNamesFromCertList and CERT_DupDistNames.
https://codereview.chromium.org/117973004

TBR=rsleevi@chromium.org
BUG=331625
TEST=none

Review URL: https://codereview.chromium.org/120693004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243265 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243266 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243266