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

chrome/browser/chromeos/login/screens/base_screen.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 84 matching lines @@
    private:
     BaseScreen& screen_;
     ::login::ScreenContext& context_;
   };
 
   // Sends all pending context changes to the JS side.
   void CommitContextChanges();
 
   // Screen can call this method to notify framework that it have finished
   // it's work with |outcome|.
-  void Finish(BaseScreenDelegate::ExitCodes exit_code);
+  void Finish(ScreenExitCode exit_code);
 
   // The method is called each time some key in screen context is
   // updated by JS side. Default implementation does nothing, so
   // subclasses should override it in order to observe updates in
   // screen context.
   virtual void OnContextKeyUpdated(const ::login::ScreenContext::KeyType& key);
 
   // Returns scoped context editor. The editor or it's copies should not outlive
   // current BaseScreen instance.
   ContextEditor GetContextEditor();
@@ skipping 33 matching lines @@
   BaseScreenDelegate* base_screen_delegate_ = nullptr;
 
   const OobeScreen screen_id_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_H_