[cros] update screen re-factoring pt.1

chrome/browser/chromeos/login/wizard_screen.h

 // Copyright (c) 2010 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_WIZARD_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WIZARD_SCREEN_H_
 #pragma once
 
-#include "ui/gfx/canvas.h"
-
 class WizardScreen;
 namespace chromeos {
 class ScreenObserver;
 }  // namespace chromeos
 namespace gfx {
 class Size;
 }  // namespace gfx
 namespace views {
 class View;
 }  // namespace views
@@ skipping 24 matching lines @@
   virtual void Hide() = 0;
   // Returns the size the screen.
   virtual gfx::Size GetScreenSize() const = 0;
 
  protected:
   explicit WizardScreen(WizardScreenDelegate* delegate): delegate_(delegate) {}
   virtual ~WizardScreen() {}
 
   WizardScreenDelegate* delegate() { return delegate_; }
 
-  // Refreshes screen state. Should be called after view is made visible.
-  virtual void Refresh() = 0;
-
  private:
   WizardScreenDelegate* delegate_;
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WIZARD_SCREEN_H_