Make CertVerifier a pure virtual interface.

net/socket/ssl_client_socket_openssl.cc

 // 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.
 
 // OpenSSL binding for SSLClientSocket. The class layout and general principle
 // of operation is derived from SSLClientSocketNSS.
 
 #include "net/socket/ssl_client_socket_openssl.h"
 
 #include <openssl/ssl.h>
 #include <openssl/err.h>
 
 #include "base/bind.h"
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
 #include "base/synchronization/lock.h"
 #include "crypto/openssl_util.h"
 #include "net/base/cert_verifier.h"
 #include "net/base/net_errors.h"
 #include "net/base/openssl_private_key_store.h"
+#include "net/base/single_request_cert_verifier.h"
 #include "net/base/ssl_cert_request_info.h"
 #include "net/base/ssl_connection_status_flags.h"
 #include "net/base/ssl_info.h"
 #include "net/base/x509_certificate_net_log_param.h"
 #include "net/socket/ssl_error_params.h"
 
 namespace net {
 
 namespace {
 
@@ skipping 1268 matching lines @@
     net_log_.AddByteTransferEvent(NetLog::TYPE_SSL_SOCKET_BYTES_SENT, rv,
                                   user_write_buf_->data());
     return rv;
   }
 
   int err = SSL_get_error(ssl_, rv);
   return MapOpenSSLError(err, err_tracer);
 }
 
 }  // namespace net