Switch to OpenSSL's |EVP_PKEY_up_ref| signature.

crypto/ec_private_key.cc

Index: crypto/ec_private_key.cc
diff --git a/crypto/ec_private_key.cc b/crypto/ec_private_key.cc
index 8f3c4110ace794241dd5d22af79f60346027159c..a8005bcf68cbf63e604dfb76314fb82c27f5986f 100644
--- a/crypto/ec_private_key.cc
+++ b/crypto/ec_private_key.cc
@@ -146,8 +146,10 @@ std::unique_ptr<ECPrivateKey> ECPrivateKey::CreateFromEncryptedPrivateKeyInfo(
 
 std::unique_ptr<ECPrivateKey> ECPrivateKey::Copy() const {
   std::unique_ptr<ECPrivateKey> copy(new ECPrivateKey());
-  if (key_)
-    copy->key_ = EVP_PKEY_up_ref(key_);
+  if (key_) {
+    EVP_PKEY_up_ref(key_);
+    copy->key_ = key_;
+  }
   return copy;
 }