Make the request initiator Optional

net/url_request/url_fetcher_core.cc

Index: net/url_request/url_fetcher_core.cc
diff --git a/net/url_request/url_fetcher_core.cc b/net/url_request/url_fetcher_core.cc
index d83f52f2ccbc15532d8c314e0142176ba4901b52..8333d56690e20585a2e107af6be6efccf95e4d80 100644
--- a/net/url_request/url_fetcher_core.cc
+++ b/net/url_request/url_fetcher_core.cc
@@ -560,8 +560,9 @@ void URLFetcherCore::StartURLRequest() {
   request_->set_referrer_policy(referrer_policy_);
   request_->set_first_party_for_cookies(initiator_.is_empty() ? original_url_
                                                               : initiator_);
-  request_->set_initiator(initiator_.is_empty() ? url::Origin(original_url_)
-                                                : url::Origin(initiator_));
+  request_->set_initiator(initiator_.is_empty()
+                              ? new url::NullableOrigin(original_url_)
+                              : new url::NullableOrigin(initiator_));
   if (url_request_data_key_ && !url_request_create_data_callback_.is_null()) {
     request_->SetUserData(url_request_data_key_,
                           url_request_create_data_callback_.Run());