Adding Null check in onAuthRequired() for handling FTP requests

extensions/browser/api/web_request/web_request_api.cc

Index: extensions/browser/api/web_request/web_request_api.cc
diff --git a/extensions/browser/api/web_request/web_request_api.cc b/extensions/browser/api/web_request/web_request_api.cc
index 6af34768b95d232b8dd1d8a90960d516a9c858a1..279276b638c99a7c4e75ed801ee3a6de9cd2f173 100644
--- a/extensions/browser/api/web_request/web_request_api.cc
+++ b/extensions/browser/api/web_request/web_request_api.cc
@@ -997,8 +997,9 @@ ExtensionWebRequestEventRouter::OnAuthRequired(
   challenger->SetInteger(keys::kPortKey, auth_info.challenger.port());
   dict->Set(keys::kChallengerKey, challenger);
   dict->Set(keys::kStatusLineKey, GetStatusLine(request->response_headers()));
-  dict->SetInteger(keys::kStatusCodeKey,
-      request->response_headers()->response_code());
+  if (request->response_headers())
+    dict->SetInteger(keys::kStatusCodeKey,
+                     request->response_headers()->response_code());
   if (extra_info_spec & ExtraInfoSpec::RESPONSE_HEADERS) {
     dict->Set(keys::kResponseHeadersKey,
               GetResponseHeadersList(request->response_headers()));