Make CertVerifier a pure virtual interface.

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 0288173d3874a8cd49195e453970e1238c0a9583..2169a21e8ba804f08c00087f3a302d597705dc5a 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -34,12 +34,12 @@
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/url_fetcher.h"
-#include "net/base/cert_verifier.h"
 #include "net/base/cookie_monster.h"
 #include "net/base/default_origin_bound_cert_store.h"
 #include "net/base/host_cache.h"
 #include "net/base/host_resolver.h"
 #include "net/base/mapped_host_resolver.h"
+#include "net/base/multi_threaded_cert_verifier.h"
 #include "net/base/net_util.h"
 #include "net/base/origin_bound_cert_service.h"
 #include "net/base/sdch_manager.h"
@@ -395,7 +395,7 @@ void IOThread::Init() {
       &system_enable_referrers_));
   globals_->host_resolver.reset(
       CreateGlobalHostResolver(net_log_));
-  globals_->cert_verifier.reset(new net::CertVerifier);
+  globals_->cert_verifier.reset(new net::MultiThreadedCertVerifier);
   globals_->transport_security_state.reset(new net::TransportSecurityState(""));
   globals_->ssl_config_service = GetSSLConfigService();
   globals_->http_auth_handler_factory.reset(CreateDefaultAuthHandlerFactory(