Remove base::Value::CreateNullValue

chrome/browser/ui/webui/options/certificate_manager_handler.cc

Index: chrome/browser/ui/webui/options/certificate_manager_handler.cc
diff --git a/chrome/browser/ui/webui/options/certificate_manager_handler.cc b/chrome/browser/ui/webui/options/certificate_manager_handler.cc
index eda33f4b0740767b9383ff1de8f80d8c88732bd3..cce634b34b878f725ed1bc70fff8ac46360d8e0a 100644
--- a/chrome/browser/ui/webui/options/certificate_manager_handler.cc
+++ b/chrome/browser/ui/webui/options/certificate_manager_handler.cc
@@ -1195,9 +1195,9 @@ void CertificateManagerHandler::ShowError(const std::string& title,
   auto error_value = base::MakeUnique<base::Value>(error);
   auto ok_title_value =
       base::MakeUnique<base::Value>(l10n_util::GetStringUTF8(IDS_OK));
-  auto cancel_title_value = base::Value::CreateNullValue();
-  auto ok_callback_value = base::Value::CreateNullValue();
-  auto cancel_callback_value = base::Value::CreateNullValue();
+  auto cancel_title_value = base::MakeUnique<base::Value>();
+  auto ok_callback_value = base::MakeUnique<base::Value>();
+  auto cancel_callback_value = base::MakeUnique<base::Value>();
   std::vector<const base::Value*> args = {
       title_value.get(),       error_value.get(),
       ok_title_value.get(),    cancel_title_value.get(),