Remove ENGINE indirection from Android SSLPrivateKey.

net/android/keystore_openssl.h

-// Copyright (c) 2013 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 NET_ANDROID_KEYSTORE_OPENSSL_H
-#define NET_ANDROID_KEYSTORE_OPENSSL_H
-
-#include <jni.h>
-#include <openssl/evp.h>
-
-#include "crypto/scoped_openssl_types.h"
-#include "net/base/net_export.h"
-
-// The features provided here are highly implementation specific and are
-// segregated from net/android/keystore.h because the latter only provides
-// simply JNI stubs to call Java code which only uses platform APIs.
-
-namespace net {
-namespace android {
-
-// Create a custom OpenSSL EVP_PKEY instance that wraps a platform
-// java.security.PrivateKey object, and will call the platform APIs
-// through JNI to implement signing (and only signing).
-//
-// This method can be called from any thread. It shall only be used
-// to implement client certificate handling though.
-//
-// |private_key| is a JNI local (or global) reference to the Java
-// PrivateKey object.
-//
-// Returns a new EVP_PKEY* object with the following features:
-//
-// - Only contains a private key.
-//
-// - Owns its own _global_ JNI reference to the object. This means the
-//   caller can free |private_key| safely after the call, and that the
-//   the returned EVP_PKEY instance can be used from any thread.
-//
-// - Uses a custom method to implement the minimum functions required to
-//   *sign* the digest that is part of the "Verify Certificate" message
-//   during the OpenSSL handshake. Anything else will result in undefined
-//   behaviour.
-NET_EXPORT crypto::ScopedEVP_PKEY GetOpenSSLPrivateKeyWrapper(
-    jobject private_key);
-
-}  // namespace android
-}  // namespace net
-
-#endif  // NET_ANDROID_KEYSTORE_OPENSSL_H