Increase the lifetime of Navigation Preload related objects.

content/renderer/service_worker/service_worker_context_client.h

Index: content/renderer/service_worker/service_worker_context_client.h
diff --git a/content/renderer/service_worker/service_worker_context_client.h b/content/renderer/service_worker/service_worker_context_client.h
index 7bea7c7c90cd3a708fcb5bb73a764889159e551d..6d6a5d34bef88f0bbbf2d3eab18c776656c61593 100644
--- a/content/renderer/service_worker/service_worker_context_client.h
+++ b/content/renderer/service_worker/service_worker_context_client.h
@@ -271,6 +271,7 @@ class ServiceWorkerContextClient : public blink::WebServiceWorkerContextClient,
   void OnNavigationPreloadError(
       int fetch_event_id,
       std::unique_ptr<blink::WebServiceWorkerError> error);
+  void OnNavigationPreloadComplete(int fetch_event_id);

[falken, 2017/01/18 14:24:59]

Maybe it's time for a short comment for the diff between Response, Error, and
Complete.

// Called to resolve the FetchEvent.preloadResponse promise.
void OnResponse
// Called to reject the FetchEvent.preloadResponse promise.
void OnError
// Called to....??
void OnComplete

[horo, 2017/01/18 16:14:57]

Done.

 
   base::WeakPtr<ServiceWorkerContextClient> GetWeakPtr();