Make CertVerifier a pure virtual interface.

chrome/service/net/service_url_request_context.cc

Index: chrome/service/net/service_url_request_context.cc
diff --git a/chrome/service/net/service_url_request_context.cc b/chrome/service/net/service_url_request_context.cc
index 6a11d70bab2f79e6856ce6efed1ddc88063b90ad..9609f061f13185c484aba197b047861a044bc165 100644
--- a/chrome/service/net/service_url_request_context.cc
+++ b/chrome/service/net/service_url_request_context.cc
@@ -14,9 +14,9 @@
 #include "base/sys_info.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/service/service_process.h"
-#include "net/base/cert_verifier.h"
 #include "net/base/cookie_monster.h"
 #include "net/base/host_resolver.h"
+#include "net/base/multi_threaded_cert_verifier.h"
 #include "net/base/ssl_config_service_defaults.h"
 #include "net/ftp/ftp_network_layer.h"
 #include "net/http/http_auth_handler_factory.h"
@@ -115,7 +115,7 @@ ServiceURLRequestContext::ServiceURLRequestContext(
                                     NULL));
   storage_.set_proxy_service(net::ProxyService::CreateUsingSystemProxyResolver(
       net_proxy_config_service, 0u, NULL));
-  storage_.set_cert_verifier(new net::CertVerifier);
+  storage_.set_cert_verifier(new net::MultiThreadedCertVerifier);
   storage_.set_ftp_transaction_factory(
       new net::FtpNetworkLayer(host_resolver()));
   storage_.set_ssl_config_service(new net::SSLConfigServiceDefaults);