Foreign fetch should not intercept same origin or main resource requests.

content/browser/service_worker/foreign_fetch_request_handler.cc

Index: content/browser/service_worker/foreign_fetch_request_handler.cc
diff --git a/content/browser/service_worker/foreign_fetch_request_handler.cc b/content/browser/service_worker/foreign_fetch_request_handler.cc
index ee9aa4b49dd84b0de863f1e8be851310680bd719..2034266deb008f00ac5cfd24906801543e05a250 100644
--- a/content/browser/service_worker/foreign_fetch_request_handler.cc
+++ b/content/browser/service_worker/foreign_fetch_request_handler.cc
@@ -67,6 +67,11 @@ void ForeignFetchRequestHandler::InitializeHandler(
     return;
   }
 
+  if (request->initiator().IsSameOriginWith(url::Origin(request->url())))
+    return;
+  if (ServiceWorkerUtils::IsMainResourceType(resource_type))
+    return;
+
   // Any more precise checks to see if the request should be intercepted are
   // asynchronous, so just create our handler in all cases.
   std::unique_ptr<ForeignFetchRequestHandler> handler(