webRequest.onAuthRequired listeners can provide authentication credentials.

net/base/auth.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 "net/base/auth.h"
 
 namespace net {
 
 AuthChallengeInfo::AuthChallengeInfo() : is_proxy(false) {
 }
 
 bool AuthChallengeInfo::Equals(const AuthChallengeInfo& that) const {
   return (this->is_proxy == that.is_proxy &&
           this->challenger.Equals(that.challenger) &&
           this->scheme == that.scheme &&
           this->realm == that.realm);
 }
 
 AuthChallengeInfo::~AuthChallengeInfo() {
 }
 
 AuthData::AuthData() : state(AUTH_STATE_NEED_AUTH) {
 }
 
 AuthData::~AuthData() {
 }
 
+AuthCredentials::AuthCredentials() : is_valid(false) {
+}
+
+AuthCredentials::~AuthCredentials() {
+}
+
 }  // namespace net