webRequest.onAuthRequired listeners can provide authentication credentials.

chrome/browser/net/chrome_network_delegate.cc

 // Copyright (c) 2011 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 "chrome/browser/net/chrome_network_delegate.h"
 
 #include "base/logging.h"
 #include "chrome/browser/custom_handlers/protocol_handler_registry.h"
 #include "chrome/browser/extensions/extension_event_router_forwarder.h"
 #include "chrome/browser/extensions/extension_info_map.h"
@@ skipping 142 matching lines @@
   ExtensionWebRequestEventRouter::GetInstance()->OnURLRequestDestroyed(
       profile_, request);
 }
 
 void ChromeNetworkDelegate::OnPACScriptError(int line_number,
                                              const string16& error) {
   ExtensionProxyEventRouter::GetInstance()->OnPACScriptError(
       event_router_.get(), profile_, line_number, error);
 }
 
-void ChromeNetworkDelegate::OnAuthRequired(
+int ChromeNetworkDelegate::OnAuthRequired(
     net::URLRequest* request,
-    const net::AuthChallengeInfo& auth_info) {
-  ExtensionWebRequestEventRouter::GetInstance()->OnAuthRequired(
-      profile_, extension_info_map_.get(), request, auth_info);
+    const net::AuthChallengeInfo& auth_info,
+    net::CompletionCallback* callback,
+    net::AuthCredentials* credentials) {
+  return ExtensionWebRequestEventRouter::GetInstance()->OnAuthRequired(
+      profile_, extension_info_map_.get(), request, auth_info,
+      callback, credentials);
 }