Make CertVerifier a pure virtual interface.

net/socket/ssl_client_socket_pool_unittest.cc

Index: net/socket/ssl_client_socket_pool_unittest.cc
diff --git a/net/socket/ssl_client_socket_pool_unittest.cc b/net/socket/ssl_client_socket_pool_unittest.cc
index df893f90d35d7eb89bd059bea7378fe3af45f1d8..a86398754982155c12086c897d2bf5b51a0cb6d9 100644
--- a/net/socket/ssl_client_socket_pool_unittest.cc
+++ b/net/socket/ssl_client_socket_pool_unittest.cc
@@ -10,8 +10,8 @@
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "net/base/auth.h"
-#include "net/base/cert_verifier.h"
 #include "net/base/mock_host_resolver.h"
+#include "net/base/multi_threaded_cert_verifier.h"
 #include "net/base/net_errors.h"
 #include "net/base/ssl_config_service_defaults.h"
 #include "net/base/sys_addrinfo.h"
@@ -146,7 +146,7 @@ class SSLClientSocketPoolTest : public testing::Test {
 
   MockClientSocketFactory socket_factory_;
   MockCachingHostResolver host_resolver_;
-  CertVerifier cert_verifier_;
+  MultiThreadedCertVerifier cert_verifier_;
   const scoped_ptr<ProxyService> proxy_service_;
   const scoped_refptr<SSLConfigService> ssl_config_service_;
   const scoped_ptr<HttpAuthHandlerFactory> http_auth_handler_factory_;