NSS: Handle unfriendly tokens in client auth.

BUG=42073,113434

Review URL: https://codereview.chromium.org/83793006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237487 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237487