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

content/renderer/render_frame_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <algorithm>
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 5145 matching lines @@
   // TODO(clamy): Remove this when we switch to Mojo streams.
   stream_override->on_delete = base::BindOnce(
       [](base::WeakPtr<RenderFrameImpl> weak_self, const GURL& url) {
         if (RenderFrameImpl* self = weak_self.get()) {
           self->Send(
               new FrameHostMsg_StreamHandleConsumed(self->routing_id_, url));
         }
       },
       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.
   std::unique_ptr<blink::WebScopedUserGesture> gesture(
       request_params.has_user_gesture ? new blink::WebScopedUserGesture(frame_)
                                       : nullptr);
 
   browser_side_navigation_pending_ = false;
 
   NavigateInternal(common_params, StartNavigationParams(), request_params,
@@ skipping 1736 matching lines @@
       replaces_current_history_item(info.replaces_current_history_item),
       history_navigation_in_new_child_frame(
           info.is_history_navigation_in_new_child_frame),
       client_redirect(info.is_client_redirect),
       triggering_event_info(info.triggering_event_info),
       cache_disabled(info.is_cache_disabled),
       form(info.form),
       source_location(info.source_location) {}
 
 }  // namespace content