Merge pull request dotnet/corefx#9993 from bartonjs/x509_upref
authorJeremy Barton <jbarton@microsoft.com>
Tue, 12 Jul 2016 14:52:46 +0000 (07:52 -0700)
committerGitHub <noreply@github.com>
Tue, 12 Jul 2016 14:52:46 +0000 (07:52 -0700)
Use X509UpRef instead of X509Duplicate

Commit migrated from https://github.com/dotnet/corefx/commit/63819d9824d452de9a6e7116e193ba16249ac2ce


Trivial merge