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Use X509_chain_up_ref, EVP_PKEY_dup, and newly-added X509_up_ref
instead. Also RAII OpenSSLClientKeyStore.

BUG=none

Review URL: https://codereview.chromium.org/474663002

Cr-Commit-Position: refs/heads/master@{#289498}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289498 0039d316-1c4b-4281-b951-d872f2087c98