Update from chromium https://crrev.com/301725/

net/ssl/client_cert_store_nss.h

Index: net/ssl/client_cert_store_nss.h
diff --git a/net/ssl/client_cert_store_nss.h b/net/ssl/client_cert_store_nss.h
index 38895aa52283dfd36273a8bfb78d8ed5b85f5de8..f6d80993a4e2e9f77e17482c7d0f64f87b080302 100644
--- a/net/ssl/client_cert_store_nss.h
+++ b/net/ssl/client_cert_store_nss.h
@@ -27,12 +27,12 @@ class NET_EXPORT ClientCertStoreNSS : public ClientCertStore {
 
   explicit ClientCertStoreNSS(
       const PasswordDelegateFactory& password_delegate_factory);
-  virtual ~ClientCertStoreNSS();
+  ~ClientCertStoreNSS() override;
 
   // ClientCertStore:
-  virtual void GetClientCerts(const SSLCertRequestInfo& cert_request_info,
-                              CertificateList* selected_certs,
-                              const base::Closure& callback) override;
+  void GetClientCerts(const SSLCertRequestInfo& cert_request_info,
+                      CertificateList* selected_certs,
+                      const base::Closure& callback) override;
 
  protected:
   // Examines the certificates in |cert_list| to find all certificates that