cros: Move BaseScreenDelegate::ExitCodes into separate file, ScreenExitCode.

chrome/browser/chromeos/login/screens/wrong_hwid_screen.cc

 // Copyright (c) 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/screens/wrong_hwid_screen.h"
 
 #include "chrome/browser/chromeos/login/screens/base_screen_delegate.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 
 namespace chromeos {
@@ skipping 16 matching lines @@
   if (view_)
     view_->Show();
 }
 
 void WrongHWIDScreen::Hide() {
   if (view_)
     view_->Hide();
 }
 
 void WrongHWIDScreen::OnExit() {
-  Finish(BaseScreenDelegate::WRONG_HWID_WARNING_SKIPPED);
+  Finish(ScreenExitCode::WRONG_HWID_WARNING_SKIPPED);
 }
 
 void WrongHWIDScreen::OnViewDestroyed(WrongHWIDScreenView* view) {
   if (view_ == view)
     view_ = nullptr;
 }
 
 }  // namespace chromeos