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

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

 // Copyright (c) 2011 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/base_screen.h"
 
 #include "base/logging.h"
 #include "chrome/browser/chromeos/login/screens/base_screen_delegate.h"
 #include "chrome/browser/chromeos/login/screens/model_view_channel.h"
 
@@ skipping 78 matching lines @@
   if (!channel_) {
     LOG(ERROR) << "Model-view channel for " << GetOobeScreenName(screen_id())
                << " is not ready, context changes are not sent to the view.";
     return;
   }
   base::DictionaryValue diff;
   context_.GetChangesAndReset(&diff);
   channel_->CommitContextChanges(diff);
 }
 
-void BaseScreen::Finish(BaseScreenDelegate::ExitCodes exit_code) {
+void BaseScreen::Finish(ScreenExitCode exit_code) {
   base_screen_delegate_->OnExit(*this, exit_code, &context_);
 }
 
 void BaseScreen::SetContext(::login::ScreenContext* context) {
   if (context)
     context_.CopyFrom(*context);
 }
 
 void BaseScreen::OnUserAction(const std::string& action_id) {
   LOG(WARNING) << "Unhandled user action: action_id=" << action_id;
 }
 
 void BaseScreen::OnContextKeyUpdated(
     const ::login::ScreenContext::KeyType& key) {
   LOG(WARNING) << "Unhandled context change: key=" << key;
 }
 
 BaseScreen::ContextEditor BaseScreen::GetContextEditor() {
   return ContextEditor(*this);
 }
 
 void BaseScreen::OnContextChanged(const base::DictionaryValue& diff) {
   std::vector<::login::ScreenContext::KeyType> keys;
   context_.ApplyChanges(diff, &keys);
   for (const auto& key : keys)
     OnContextKeyUpdated(key);
 }
 
 }  // namespace chromeos