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

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 1153000a67890a8d1cdf2883fb0c8437f9be3f73..ad23246aa7897829c61443d9c2325d12fdcf4722 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -5163,11 +5163,9 @@ void RenderFrameImpl::OnCommitNavigation(
       },
       weak_factory_.GetWeakPtr());
 
-  if (commit_data.url_loader_factory.is_valid()) {
-    // Chrome doesn't use interface versioning.
-    url_loader_factory_.Bind(mojom::URLLoaderFactoryPtrInfo(
-        mojo::ScopedMessagePipeHandle(commit_data.url_loader_factory), 0u));
-  }
+  // Chrome doesn't use interface versioning.
+  url_loader_factory_.Bind(mojom::URLLoaderFactoryPtrInfo(
+      mojo::ScopedMessagePipeHandle(commit_data.url_loader_factory), 0u));
 
   // If the request was initiated in the context of a user gesture then make
   // sure that the navigation also executes in the context of a user gesture.