The Appcache subresource URL factory needs to inform the URLLoaderClient if there is a failure.

content/browser/appcache/appcache_subresource_url_factory.h

Index: content/browser/appcache/appcache_subresource_url_factory.h
diff --git a/content/browser/appcache/appcache_subresource_url_factory.h b/content/browser/appcache/appcache_subresource_url_factory.h
index ef4458e8a5129e50d466a159830a27228e0261bf..bfed6d2739229420f0c9326307433c3e80b18136 100644
--- a/content/browser/appcache/appcache_subresource_url_factory.h
+++ b/content/browser/appcache/appcache_subresource_url_factory.h
@@ -59,6 +59,10 @@ class AppCacheSubresourceURLFactory : public mojom::URLLoaderFactory {
 
   void OnConnectionError();
 
+  // Notifies the |client| if there is a failure. The |error_code| contains the
+  // actual error.
+  void NotifyError(mojom::URLLoaderClientPtr client, int error_code);
+
   // Mojo binding.
   mojo::Binding<mojom::URLLoaderFactory> binding_;