This CL is a follow up to https://codereview.chromium.org/416683002/.

net/socket/ssl_session_cache_openssl.h

 // Copyright 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_SOCKET_SSL_SESSION_CACHE_OPENSSL_H
 #define NET_SOCKET_SSL_SESSION_CACHE_OPENSSL_H
 
 #include <string>
 
 #include "base/basictypes.h"
-#include "base/callback_forward.h"
 #include "net/base/net_export.h"
 
 // Avoid including OpenSSL headers here.
 typedef struct ssl_ctx_st SSL_CTX;
 typedef struct ssl_st SSL;
 
 namespace net {
 
 class SSLSessionCacheOpenSSLImpl;
 
@@ skipping 114 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SSLSessionCacheOpenSSL);
 
   SSLSessionCacheOpenSSLImpl* impl_;
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_SSL_SESSION_CACHE_OPENSSL_H