Make CertVerifier a pure virtual interface.

net/socket/ssl_host_info.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 NET_SOCKET_SSL_HOST_INFO_H_
 #define NET_SOCKET_SSL_HOST_INFO_H_
 
 #include <string>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time.h"
 #include "net/base/cert_verifier.h"
 #include "net/base/cert_verify_result.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
+#include "net/base/single_request_cert_verifier.h"
 #include "net/socket/ssl_client_socket.h"
 
 namespace net {
 
 class X509Certificate;
 struct SSLConfig;
 
 // SSLHostInfo is an interface for fetching information about an SSL server.
 // This information may be stored on disk so does not include keys or session
 // information etc. Primarily it's intended for caching the server's
@@ skipping 106 matching lines @@
 
   // GetForHost returns a fresh, allocated SSLHostInfo for the given hostname
   // or NULL on failure.
   virtual SSLHostInfo* GetForHost(const std::string& hostname,
                                   const SSLConfig& ssl_config) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_SSL_HOST_INFO_H_