Make CertVerifier a pure virtual interface.

chrome/browser/chromeos/web_socket_proxy.cc

Index: chrome/browser/chromeos/web_socket_proxy.cc
diff --git a/chrome/browser/chromeos/web_socket_proxy.cc b/chrome/browser/chromeos/web_socket_proxy.cc
index 66a3e1aef10660c98fbfd20b332c98f6ab17fb3c..68fef8f8b988ba4888bbf76f72fe580faa62187e 100644
--- a/chrome/browser/chromeos/web_socket_proxy.cc
+++ b/chrome/browser/chromeos/web_socket_proxy.cc
@@ -50,9 +50,9 @@
 #include "googleurl/src/gurl.h"
 #include "googleurl/src/url_parse.h"
 #include "net/base/address_list.h"
-#include "net/base/cert_verifier.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/io_buffer.h"
+#include "net/base/multi_threaded_cert_verifier.h"
 #include "net/base/net_errors.h"
 #include "net/base/ssl_config_service.h"
 #include "net/socket/client_socket_factory.h"
@@ -615,7 +615,7 @@ class SSLChan : public MessageLoopForIO::Watcher {
         net::ClientSocketFactory::GetDefaultFactory();
     net::SSLClientSocketContext ssl_context;
     if (!cert_verifier_.get())
-      cert_verifier_.reset(new net::CertVerifier());
+      cert_verifier_.reset(new net::MultiThreadedCertVerifier());
     ssl_context.cert_verifier = cert_verifier_.get();
     socket_.reset(factory->CreateSSLClientSocket(
         handle, host_port_pair_, ssl_config_, NULL, ssl_context));