Use new BoringSSL scopers in //crypto

crypto/rsa_private_key.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CRYPTO_RSA_PRIVATE_KEY_H_
 #define CRYPTO_RSA_PRIVATE_KEY_H_
 
+#include <openssl/base.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "crypto/crypto_export.h"
 
-// Forward declaration for openssl/*.h
-typedef struct evp_pkey_st EVP_PKEY;
-
 namespace crypto {
 
 // Encapsulates an RSA private key. Can be used to generate new keys, export
 // keys to other formats, or to extract a public key.
 // TODO(hclam): This class should be ref-counted so it can be reused easily.
 class CRYPTO_EXPORT RSAPrivateKey {
  public:
   ~RSAPrivateKey();
 
   // Create a new random instance. Can return NULL if initialization fails.
   static std::unique_ptr<RSAPrivateKey> Create(uint16_t num_bits);
 
   // Create a new instance by importing an existing private key. The format is
   // an ASN.1-encoded PrivateKeyInfo block from PKCS #8. This can return NULL if
   // initialization fails.
   static std::unique_ptr<RSAPrivateKey> CreateFromPrivateKeyInfo(
       const std::vector<uint8_t>& input);
 
   // Create a new instance from an existing EVP_PKEY, taking a
   // reference to it. |key| must be an RSA key. Returns NULL on
   // failure.
   static std::unique_ptr<RSAPrivateKey> CreateFromKey(EVP_PKEY* key);
 
-  EVP_PKEY* key() { return key_; }
+  EVP_PKEY* key() { return key_.get(); }
 
   // Creates a copy of the object.
   std::unique_ptr<RSAPrivateKey> Copy() const;
 
   // Exports the private key to a PKCS #8 PrivateKeyInfo block.
   bool ExportPrivateKey(std::vector<uint8_t>* output) const;
 
   // Exports the public key to an X509 SubjectPublicKeyInfo block.
   bool ExportPublicKey(std::vector<uint8_t>* output) const;
 
  private:
   // Constructor is private. Use one of the Create*() methods above instead.
   RSAPrivateKey();
 
-  EVP_PKEY* key_;
+  bssl::UniquePtr<EVP_PKEY> key_;
 
   DISALLOW_COPY_AND_ASSIGN(RSAPrivateKey);
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_RSA_PRIVATE_KEY_H_