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

chrome/browser/chromeos/login/enrollment/enrollment_screen_unittest.cc

 // Copyright (c) 2017 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/enrollment/enrollment_screen.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/test/scoped_mock_time_message_loop_task_runner.h"
@@ skipping 180 matching lines @@
   EnterpriseEnrollmentHelper::SetupEnrollmentHelperMock(
       &EnrollmentScreenUnitTest::MockEnrollmentHelperCreator<true>);
 
   SetUpEnrollmentScreen();
 
   // Set up expectation for BaseScreenDelegate::OnExit to be called
   // with BaseScreenDelegate::ENTERPRISE_ENROLLMENT_COMPLETED
   // This is how we check that the code finishes and cleanly exits
   // the enterprise enrollment flow.
   EXPECT_CALL(*GetBaseScreenDelegate(),
-              OnExit(_, BaseScreenDelegate::ENTERPRISE_ENROLLMENT_COMPLETED, _))
+              OnExit(_, ScreenExitCode::ENTERPRISE_ENROLLMENT_COMPLETED, _))
       .Times(1);
 
   // Start zero-touch enrollment.
   enrollment_screen_->Show();
 }
 }  // namespace chromeos