Increase the lifetime of Navigation Preload related objects.

content/browser/service_worker/service_worker_url_request_job.cc

Index: content/browser/service_worker/service_worker_url_request_job.cc
diff --git a/content/browser/service_worker/service_worker_url_request_job.cc b/content/browser/service_worker/service_worker_url_request_job.cc
index 62325d45afcad222a5e754272585a8669ae67a78..f69a0ac376a99a62458a61cead649368117f6733 100644
--- a/content/browser/service_worker/service_worker_url_request_job.cc
+++ b/content/browser/service_worker/service_worker_url_request_job.cc
@@ -565,7 +565,13 @@ void ServiceWorkerURLRequestJob::DidDispatchFetchEvent(
     ServiceWorkerFetchEventResult fetch_result,
     const ServiceWorkerResponse& response,
     const scoped_refptr<ServiceWorkerVersion>& version) {
-  fetch_dispatcher_.reset();
+  // Do not clear |fetch_dispatcher_| if it has dispatched a navigation preload
+  // request to keep the mojom::URLLoader related objects in it, because the
+  // preload response might still need to be streamed even after calling
+  // respondWith().
+  if (!did_navigation_preload_) {
+    fetch_dispatcher_.reset();
+  }
   ServiceWorkerMetrics::RecordFetchEventStatus(IsMainResourceLoad(), status);
 
   ServiceWorkerMetrics::URLRequestJobResult result =