Fix RSAPrivateKey::ExportPrivateKey documentation.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 182 matching lines @@
 #if defined(USE_OPENSSL)
   EVP_PKEY* key() { return key_; }
 #else
   SECKEYPrivateKey* key() { return key_; }
   SECKEYPublicKey* public_key() { return public_key_; }
 #endif
 
   // Creates a copy of the object.
   RSAPrivateKey* Copy() const;
 
-  // Exports the private key to a PKCS #1 PrivateKey block.
+  // 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();
 
 #if defined(USE_OPENSSL)
   EVP_PKEY* key_;
 #else
   SECKEYPrivateKey* key_;
   SECKEYPublicKey* public_key_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(RSAPrivateKey);
 };
 
 }  // namespace crypto
 
 #endif  // CRYPTO_RSA_PRIVATE_KEY_H_