NavigationThrottle: allow customization of net::Error when blocking

components/subresource_filter/content/browser/subframe_navigation_filtering_throttle.cc

 // Copyright 2017 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 "components/subresource_filter/content/browser/subframe_navigation_filtering_throttle.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "components/subresource_filter/core/common/time_measurements.h"
@@ skipping 39 matching lines @@
   return "SubframeNavigationFilteringThrottle";
 }
 
 content::NavigationThrottle::ThrottleCheckResult
 SubframeNavigationFilteringThrottle::DeferToCalculateLoadPolicy() {
   parent_frame_filter_->GetLoadPolicyForSubdocument(
       navigation_handle()->GetURL(),
       base::Bind(&SubframeNavigationFilteringThrottle::OnCalculatedLoadPolicy,
                  weak_ptr_factory_.GetWeakPtr()));
   last_defer_timestamp_ = base::TimeTicks::Now();
-  return content::NavigationThrottle::ThrottleCheckResult::DEFER;
+  return content::NavigationThrottle::DEFER;
 }
 
 void SubframeNavigationFilteringThrottle::OnCalculatedLoadPolicy(
     LoadPolicy policy) {
   DCHECK(!last_defer_timestamp_.is_null());
   total_defer_time_ += base::TimeTicks::Now() - last_defer_timestamp_;
   // TODO(csharrison): Support WouldDisallow pattern and expose the policy for
   // metrics. Also, cancel with BLOCK_AND_COLLAPSE when it is implemented.
   if (policy == LoadPolicy::DISALLOW) {
     disallowed_ = true;
     parent_frame_filter_->ReportDisallowedLoad();
     navigation_handle()->CancelDeferredNavigation(
         content::NavigationThrottle::CANCEL);
   } else {
     navigation_handle()->Resume();
   }
 }
 
 }  // namespace subresource_filter