PlzNavigate: Show error pages when the navigation failed before commit

content/browser/loader/resource_dispatcher_host_impl.cc

 // Copyright (c) 2012 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <algorithm>
 #include <set>
@@ skipping 1848 matching lines @@
 
   if (is_shutdown_ ||
       // TODO(davidben): Check ShouldServiceRequest here. This is important; it
       // needs to be checked relative to the child that /requested/ the
       // navigation. It's where file upload checks, etc., come in.
       (delegate_ && !delegate_->ShouldBeginRequest(
           info.begin_params.method,
           info.common_params.url,
           resource_type,
           resource_context))) {
-    loader->NotifyRequestFailed(net::ERR_ABORTED);
+    loader->NotifyRequestFailed(false, net::ERR_ABORTED);
     return;
   }
 
   // Save the URL on the stack to help catch URLRequests which outlive their
   // URLRequestContexts. See https://crbug.com/90971
   char url_buf[128];
   base::strlcpy(
       url_buf, info.common_params.url.spec().c_str(), arraysize(url_buf));
   base::debug::Alias(url_buf);
   CHECK(ContainsKey(active_resource_contexts_, resource_context));
@@ skipping 465 matching lines @@
 
   // Add a flag to selectively bypass the data reduction proxy if the resource
   // type is not an image.
   if (request_data.resource_type != RESOURCE_TYPE_IMAGE)
     load_flags |= net::LOAD_BYPASS_DATA_REDUCTION_PROXY;
 
   return load_flags;
 }
 
 }  // namespace content