Remove first_message argument from AuthenticatorFactory::Create().

remoting/host/pam_authorization_factory_posix.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 "remoting/host/pam_authorization_factory_posix.h"
 
 #include <security/pam_appl.h>
 
 #include <utility>
 
@@ skipping 149 matching lines @@
   return PAM_SUCCESS;
 }
 
 PamAuthorizationFactory::PamAuthorizationFactory(
     scoped_ptr<protocol::AuthenticatorFactory> underlying)
     : underlying_(std::move(underlying)) {}
 
 PamAuthorizationFactory::~PamAuthorizationFactory() {}
 
 scoped_ptr<protocol::Authenticator>
-PamAuthorizationFactory::CreateAuthenticator(
-    const std::string& local_jid,
-    const std::string& remote_jid,
-    const buzz::XmlElement* first_message) {
+PamAuthorizationFactory::CreateAuthenticator(const std::string& local_jid,
+                                             const std::string& remote_jid) {
   scoped_ptr<protocol::Authenticator> authenticator(
-      underlying_->CreateAuthenticator(local_jid, remote_jid, first_message));
+      underlying_->CreateAuthenticator(local_jid, remote_jid));
   return make_scoped_ptr(new PamAuthorizer(std::move(authenticator)));
 }
 
 }  // namespace remoting