Introduce AncestorThrottle, which will process 'X-Frame-Options' headers.

components/error_page/common/localized_error.cc

Index: components/error_page/common/localized_error.cc
diff --git a/components/error_page/common/localized_error.cc b/components/error_page/common/localized_error.cc
index 3a84ddb27d990ee0eb2319b6509eb1319f80bb5e..dd5fe55c3673bb7baee650fef1d0bdbcec6b33b7 100644
--- a/components/error_page/common/localized_error.cc
+++ b/components/error_page/common/localized_error.cc
@@ -92,6 +92,7 @@ struct LocalizedErrorMap {
   int suggestions;  // Bitmap of SUGGEST_* values.
 };
 
+// clang-format off
 const LocalizedErrorMap net_error_options[] = {
   {net::ERR_TIMED_OUT,
    IDS_ERRORPAGES_TITLE_NOT_AVAILABLE,
@@ -352,7 +353,15 @@ const LocalizedErrorMap net_error_options[] = {
    IDS_ERRORPAGES_DETAILS_SSL_PROTOCOL_ERROR,
    SUGGEST_NONE,
   },
+  {net::ERR_BLOCKED_BY_RESPONSE,
+   IDS_ERRORPAGES_TITLE_BLOCKED,
+   IDS_ERRORPAGES_HEADING_BLOCKED,
+   IDS_ERRORPAGES_SUMMARY_CONNECTION_REFUSED,
+   IDS_ERRORPAGES_DETAILS_CONNECTION_REFUSED,
+   SUGGEST_NONE,
+  },
 };
+// 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