Add an error page for resources blocked via XSS Auditor.

net/base/net_error_list.h

 // 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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate enum values.
 
 // This file contains the list of network errors.
 
 //
@@ skipping 94 matching lines @@
 
 // The request failed because the URLRequestContext is shutting down, or has
 // been shut down.
 NET_ERROR(CONTEXT_SHUT_DOWN, -26)
 
 // The request failed because the response was delivered along with requirements
 // which are not met ('X-Frame-Options' and 'Content-Security-Policy' ancestor
 // checks, for instance).
 NET_ERROR(BLOCKED_BY_RESPONSE, -27)
 
+// The request failed after the response was received, based on client-side
+// heuristics that point to the possiblility of a cross-site scripting attack.
+NET_ERROR(BLOCKED_BY_XSS_AUDITOR, -28)
+
 // A connection was closed (corresponding to a TCP FIN).
 NET_ERROR(CONNECTION_CLOSED, -100)
 
 // A connection was reset (corresponding to a TCP RST).
 NET_ERROR(CONNECTION_RESET, -101)
 
 // A connection attempt was refused.
 NET_ERROR(CONNECTION_REFUSED, -102)
 
 // A connection timed out as a result of not receiving an ACK for data sent.
@@ skipping 715 matching lines @@
 NET_ERROR(DNS_TIMED_OUT, -803)
 
 // The entry was not found in cache, for cache-only lookups.
 NET_ERROR(DNS_CACHE_MISS, -804)
 
 // Suffix search list rules prevent resolution of the given host name.
 NET_ERROR(DNS_SEARCH_EMPTY, -805)
 
 // Failed to sort addresses according to RFC3484.
 NET_ERROR(DNS_SORT_ERROR, -806)