NavigationThrottle: allow customization of net::Error when blocking

content/browser/frame_host/mixed_content_navigation_throttle.h

 // 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.
 
 #ifndef CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
 #define CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_
 
 #include <set>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/navigation_throttle.h"
 #include "content/public/common/request_context_type.h"
 #include "third_party/WebKit/public/platform/WebMixedContentContextType.h"
 
 namespace content {
 
 class FrameTreeNode;
 struct WebPreferences;
 
-using ThrottleCheckResult = NavigationThrottle::ThrottleCheckResult;
-
 // Responsible for browser-process-side mixed content security checks. It is
 // only enabled if PlzNavigate is and checks only for frame-level resource loads
 // (aka navigation loads). Sub-resources fetches are checked in the renderer
 // process by MixedContentChecker. Changes to this class might need to be
 // reflected on its renderer counterpart.
 //
 // Current mixed content W3C draft that drives this implementation:
 // https://w3c.github.io/webappsec-mixed-content/
 //
 // TODO(carlosk): For HSTS to work properly in PlzNavigate when these browser
@@ skipping 54 matching lines @@
   // values are reported to the respective renderer process after each mixed
   // content check is finished.
   std::set<int> mixed_content_features_;
 
   DISALLOW_COPY_AND_ASSIGN(MixedContentNavigationThrottle);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_MIXED_CONTENT_NAVIGATION_THROTTLE_H_