Move UserContext to its own file

chrome/browser/chromeos/login/app_launch_signin_screen.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/login/app_launch_signin_screen.h"
 
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/help_app_launcher.h"
 #include "chrome/browser/chromeos/login/login_utils.h"
-#include "chrome/browser/chromeos/login/users/user.h"
 #include "chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_ui.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace chromeos {
 
 UserManager* AppLaunchSigninScreen::test_user_manager_ = NULL;
 
@@ skipping 176 matching lines @@
      l10n_util::GetStringUTF8(IDS_LOGIN_ERROR_AUTHENTICATING_KIOSK),
      std::string(),
      HelpAppLauncher::HELP_CANT_ACCESS_ACCOUNT_OFFLINE);
 }
 
 void AppLaunchSigninScreen::OnLoginSuccess(const UserContext& user_context) {
   delegate_->OnOwnerSigninSuccess();
 }
 
 }  // namespace chromeos