Fix crash when locking a profile.

chrome/browser/chromeos/profiles/avatar_menu_actions_chromeos.cc

 // Copyright 2013 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/chromeos/profiles/avatar_menu_actions_chromeos.h"
 
 #include "ash/multi_profile_uma.h"
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "chrome/browser/chromeos/login/user_manager.h"
@@ skipping 27 matching lines @@
 bool AvatarMenuActionsChromeOS::ShouldShowAddNewProfileLink() const {
   // |browser_| can be NULL in unit_tests.
   return (!browser_ || !browser_->profile()->IsManaged()) &&
       UserManager::Get()->GetUsersAdmittedForMultiProfile().size();
 }
 
 bool AvatarMenuActionsChromeOS::ShouldShowEditProfileLink() const {
   return false;
 }
 
-content::WebContents* AvatarMenuActionsChromeOS::BeginSignOut() {
-  NOTIMPLEMENTED();
-  return NULL;
-}
-
-void AvatarMenuActionsChromeOS::SetLogoutURL(const std::string& logout_url) {
+void AvatarMenuActionsChromeOS::BeginSignOut() {
   NOTIMPLEMENTED();
 }
 
 void AvatarMenuActionsChromeOS::ActiveBrowserChanged(Browser* browser) {
   browser_ = browser;
 }
 
 }  // namespace chromeos