Make CertVerifier a pure virtual interface.

net/socket/ssl_client_socket_pool_unittest.cc

Index: net/socket/ssl_client_socket_pool_unittest.cc
===================================================================
--- net/socket/ssl_client_socket_pool_unittest.cc	(revision 128056)
+++ net/socket/ssl_client_socket_pool_unittest.cc	(working copy)
@@ -137,7 +137,7 @@
   HttpNetworkSession* CreateNetworkSession() {
     HttpNetworkSession::Params params;
     params.host_resolver = &host_resolver_;
-    params.cert_verifier = &cert_verifier_;
+    params.cert_verifier = cert_verifier_.get();
     params.proxy_service = proxy_service_.get();
     params.client_socket_factory = &socket_factory_;
     params.ssl_config_service = ssl_config_service_;
@@ -148,7 +148,7 @@
 
   MockClientSocketFactory socket_factory_;
   MockCachingHostResolver host_resolver_;
-  CertVerifier cert_verifier_;
+  scoped_ptr<CertVerifier> cert_verifier_;
   const scoped_ptr<ProxyService> proxy_service_;
   const scoped_refptr<SSLConfigService> ssl_config_service_;
   const scoped_ptr<HttpAuthHandlerFactory> http_auth_handler_factory_;