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This is a no-op change. BoringSSL deprecated EVP_PKEY_dup in favor of a new
EVP_PKEY_up_ref. This makes it more obvious there isn't actually a copy and is
more consistent with other ref-counted types.

See https://boringssl.googlesource.com/boringssl/+/517da2f1efc91b179dfb1898f826b18a6a38f547%5E%21/#F3

BUG=none

Review URL: https://codereview.chromium.org/1129083007

Cr-Commit-Position: refs/heads/master@{#329732}