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..933a35d387a757f5800e26946251afce7ca8dbfd 100644
--- a/chrome/browser/chromeos/web_socket_proxy.cc
+++ b/chrome/browser/chromeos/web_socket_proxy.cc
@@ -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(net::CertVerifier::CreateDefaultCertVerifier());
     ssl_context.cert_verifier = cert_verifier_.get();
     socket_.reset(factory->CreateSSLClientSocket(
         handle, host_port_pair_, ssl_config_, NULL, ssl_context));