Refactor client cert private key handling.

net/ssl/ssl_platform_key.h

Index: net/ssl/ssl_platform_key.h
diff --git a/net/ssl/ssl_platform_key.h b/net/ssl/ssl_platform_key.h
deleted file mode 100644
index efb42920ed655e2adf380d46df35df503147a5b2..0000000000000000000000000000000000000000
--- a/net/ssl/ssl_platform_key.h
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2015 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_SSL_SSL_PLATFORM_KEY_H_
-#define NET_SSL_SSL_PLATFORM_KEY_H_
-
-#include <memory>
-
-#include "base/memory/ref_counted.h"
-#include "net/base/net_export.h"
-
-namespace net {
-
-class SSLPrivateKey;
-class X509Certificate;
-
-// Returns an SSLPrivateKey backed by the platform private key that corresponds
-// to |certificate|'s public key. If |keychain| is nullptr, the process's
-// default search list is used instead.
-NET_EXPORT scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
-    const X509Certificate* certificate);
-
-}  // namespace net
-
-#endif  // NET_SSL_SSL_PLATFORM_KEY_H_