cros: Replace WizardController string constants with OobeScreen values.

chrome/browser/chromeos/login/ui/login_display_host_impl.h

 // Copyright 2014 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_UI_LOGIN_DISPLAY_HOST_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_HOST_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 53 matching lines @@
   LoginDisplay* CreateLoginDisplay(LoginDisplay::Delegate* delegate) override;
   gfx::NativeWindow GetNativeWindow() const override;
   OobeUI* GetOobeUI() const override;
   WebUILoginView* GetWebUILoginView() const override;
   void BeforeSessionStart() override;
   void Finalize() override;
   void OnCompleteLogin() override;
   void OpenProxySettings() override;
   void SetStatusAreaVisible(bool visible) override;
   AutoEnrollmentController* GetAutoEnrollmentController() override;
-  void StartWizard(const std::string& first_screen_name) override;
+  void StartWizard(OobeScreen first_screen_name) override;
   WizardController* GetWizardController() override;
   AppLaunchController* GetAppLaunchController() override;
   void StartUserAdding(const base::Closure& completion_callback) override;
   void CancelUserAdding() override;
   void StartSignInScreen(const LoginScreenContext& context) override;
   void OnPreferencesChanged() override;
   void PrewarmAuthentication() override;
   void StartAppLaunch(
       const std::string& app_id,
       bool diagnostic_mode,
@@ skipping 180 matching lines @@
   // pods to load.
   bool waiting_for_user_pods_;
 
   // How many times renderer has crashed.
   int crash_count_;
 
   // Way to restore if renderer have crashed.
   RestorePath restore_path_;
 
   // Stored parameters for StartWizard, required to restore in case of crash.
-  std::string first_screen_name_;
+  OobeScreen first_screen_name_;
 
   // Called before host deletion.
   base::Closure completion_callback_;
 
   // Active instance of authentication prewarmer.
   std::unique_ptr<AuthPrewarmer> auth_prewarmer_;
 
   // A focus ring controller to draw focus ring around view for keyboard
   // driven oobe.
   std::unique_ptr<FocusRingController> focus_ring_controller_;
@@ skipping 27 matching lines @@
 
   base::WeakPtrFactory<LoginDisplayHostImpl> pointer_factory_;
   base::WeakPtrFactory<LoginDisplayHostImpl> animation_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginDisplayHostImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_HOST_IMPL_H_