(Re-)introduce AncestorThrottle to handle 'X-Frame-Options'.

components/error_page/common/localized_error.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.
 
 #include "components/error_page/common/localized_error.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 64 matching lines @@
 struct LocalizedErrorMap {
   int error_code;
   unsigned int heading_resource_id;
   // Detailed summary used when the error is in the main frame and shown on
   // mouse over when the error is in a frame.
   unsigned int summary_resource_id;
   int suggestions;  // Bitmap of SUGGEST_* values.
   int buttons; // Which buttons if any to show.
 };
 
+// clang-format off
 const LocalizedErrorMap net_error_options[] = {
   {net::ERR_TIMED_OUT,
    IDS_ERRORPAGES_HEADING_NOT_AVAILABLE,
    IDS_ERRORPAGES_SUMMARY_TIMED_OUT,
    SUGGEST_CHECK_CONNECTION | SUGGEST_FIREWALL_CONFIG | SUGGEST_PROXY_CONFIG |
        SUGGEST_DIAGNOSE_TOOL,
    SHOW_BUTTON_RELOAD,
   },
   {net::ERR_CONNECTION_TIMED_OUT,
    IDS_ERRORPAGES_HEADING_NOT_AVAILABLE,
@@ skipping 203 matching lines @@
    IDS_ERRORPAGES_SUMMARY_SSL_VERSION_OR_CIPHER_MISMATCH,
    SUGGEST_UNSUPPORTED_CIPHER,
    SHOW_NO_BUTTONS,
   },
   {net::ERR_SSL_SERVER_CERT_BAD_FORMAT,
    IDS_ERRORPAGES_HEADING_INSECURE_CONNECTION,
    IDS_ERRORPAGES_SUMMARY_SSL_SECURITY_ERROR,
    SUGGEST_NONE,
    SHOW_NO_BUTTONS,
   },
+  {net::ERR_BLOCKED_BY_RESPONSE,
+   IDS_ERRORPAGES_HEADING_BLOCKED,
+   IDS_ERRORPAGES_SUMMARY_CONNECTION_REFUSED,
+   SUGGEST_NONE,
+   SHOW_NO_BUTTONS
+  },
 };
+// clang-format on
 
 // Special error page to be used in the case of navigating back to a page
 // generated by a POST.  LocalizedError::HasStrings expects this net error code
 // to also appear in the array above.
 const LocalizedErrorMap repost_error = {
   net::ERR_CACHE_MISS,
   IDS_HTTP_POST_WARNING_TITLE,
   IDS_ERRORPAGES_HTTP_POST_WARNING,
   SUGGEST_REPOST_RELOAD,
   SHOW_NO_BUTTONS,
@@ skipping 692 matching lines @@
 
 bool LocalizedError::HasStrings(const std::string& error_domain,
                                 int error_code) {
   // Whether or not the there are strings for an error does not depend on
   // whether or not the page was be generated by a POST, so just claim it was
   // not.
   return LookupErrorMap(error_domain, error_code, /*is_post=*/false) != nullptr;
 }
 
 }  // namespace error_page