Teach URLRequest about initiator checks for First-Party-Only cookies.

content/common/net/url_fetcher.cc

Index: content/common/net/url_fetcher.cc
diff --git a/content/common/net/url_fetcher.cc b/content/common/net/url_fetcher.cc
index 0433c61160f188545811d536e23e66714f7f80bd..90a664c69313ee37fe0ed78c886365a28845c2a8 100644
--- a/content/common/net/url_fetcher.cc
+++ b/content/common/net/url_fetcher.cc
@@ -21,10 +21,10 @@ base::SupportsUserData::Data* CreateURLRequestUserData(
 }  // namespace
 
 void AssociateURLFetcherWithRenderFrame(net::URLFetcher* url_fetcher,
-                                        const GURL& first_party_for_cookies,
+                                        const GURL& initiator,
                                         int render_process_id,
                                         int render_frame_id) {
-  url_fetcher->SetFirstPartyForCookies(first_party_for_cookies);
+  url_fetcher->SetInitiatorURL(initiator);
   url_fetcher->SetURLRequestUserData(
       URLRequestUserData::kUserDataKey,
       base::Bind(&CreateURLRequestUserData,