When switching processes during redirects, update the cookie policy

content/browser/loader/resource_loader.cc

Index: content/browser/loader/resource_loader.cc
diff --git a/content/browser/loader/resource_loader.cc b/content/browser/loader/resource_loader.cc
index b43d5d627912dca5c3a702ecc3fae58ed44cfb5b..5b0a9f4a284fe0997a4486f6c9ea7e6293fba2c8 100644
--- a/content/browser/loader/resource_loader.cc
+++ b/content/browser/loader/resource_loader.cc
@@ -155,9 +155,15 @@ void ResourceLoader::ReportUploadProgress() {
   }
 }
 
-void ResourceLoader::MarkAsTransferring() {
+void ResourceLoader::MarkAsTransferring(const GURL& target_url) {
+  CHECK_EQ(GetRequestInfo()->GetResourceType(), ResourceType::MAIN_FRAME)
+      << "Cannot transfer non-main frame navigations";
   is_transferring_ = true;
 
+  // When transferring a request to another process, the renderer doesn't get
+  // a chance to update the cookie policy URL. Do it here instead.
+  request()->set_first_party_for_cookies(target_url);
+
   // When an URLRequest is transferred to a new RenderViewHost, its
   // ResourceHandler should not receive any notifications because it may depend
   // on the state of the old RVH. We set a ResourceHandler that only allows