Make CertVerifier a pure virtual interface.

net/http/http_proxy_client_socket_pool_unittest.cc

Index: net/http/http_proxy_client_socket_pool_unittest.cc
diff --git a/net/http/http_proxy_client_socket_pool_unittest.cc b/net/http/http_proxy_client_socket_pool_unittest.cc
index e2276e47214e84156d56f07fbe0220eb19984f2f..936f48ef98d94f441e4860eca9301aa355c0e776 100644
--- a/net/http/http_proxy_client_socket_pool_unittest.cc
+++ b/net/http/http_proxy_client_socket_pool_unittest.cc
@@ -9,6 +9,7 @@
 #include "base/string_util.h"
 #include "base/utf_string_conversions.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/test_completion_callback.h"
@@ -201,7 +202,7 @@ class HttpProxyClientSocketPoolTest : public TestWithHttpParam {
   MockTransportClientSocketPool transport_socket_pool_;
   ClientSocketPoolHistograms ssl_histograms_;
   MockHostResolver host_resolver_;
-  CertVerifier cert_verifier_;
+  MultiThreadedCertVerifier cert_verifier_;
   const scoped_ptr<ProxyService> proxy_service_;
   const scoped_refptr<SSLConfigService> ssl_config_service_;
   SSLClientSocketPool ssl_socket_pool_;