cros: Remove unused method.

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"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/login/screens/base_screen_delegate.h"
 #include "components/login/base_screen_handler_utils.h"
 #include "components/login/screens/screen_context.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace chromeos {
 
 class ModelViewChannel;
 
 // Base class for the all OOBE/login/before-session screens.
 // Screens are identified by ID, screen and it's JS counterpart must have same
 // id.
 // Most of the screens will be re-created for each appearance with Initialize()
-// method called just once. However if initialization is too expensive, screen
-// can override result of IsPermanent() method, and do clean-up upon subsequent
-// Initialize() method calls.
+// method called just once.
 class BaseScreen {
  public:
   explicit BaseScreen(BaseScreenDelegate* base_screen_delegate);
   virtual ~BaseScreen();
 
   // ---- Old implementation ----
 
   virtual void PrepareToShow() = 0;
 
   // Makes wizard screen visible.
   virtual void Show() = 0;
 
   // Makes wizard screen invisible.
   virtual void Hide() = 0;
 
   // Returns the screen name.
   virtual std::string GetName() const = 0;
 
   // ---- New Implementation ----
 
   // Called to perform initialization of the screen. UI is guaranteed to exist
   // at this point. Screen can alter context, resulting context will be passed
-  // to JS. This method will be called once per instance of the Screen object,
-  // unless |IsPermanent()| returns |true|.
+  // to JS. This method will be called once per instance of the Screen object.
   virtual void Initialize(::login::ScreenContext* context);
 
   // Called when screen appears.
   virtual void OnShow();
   // Called when screen disappears, either because it finished it's work, or
   // because some other screen pops up.
   virtual void OnHide();
 
   // Called when we navigate from screen so that we will never return to it.
   // This is a last chance to call JS counterpart, this object will be deleted
   // soon.
   virtual void OnClose();
 
   // Indicates whether status area should be displayed while this screen is
   // displayed.
   virtual bool IsStatusAreaDisplayed();
 
-  // If this method returns |true|, screen will not be deleted once we leave it.
-  // However, Initialize() might be called several times in this case.
-  virtual bool IsPermanent();
-
   // Returns the identifier of the screen.
   virtual std::string GetID() const;
 
   // Called when user action event with |event_id|
   // happened. Notification about this event comes from the JS
   // counterpart.
   virtual void OnUserAction(const std::string& action_id);
 
   void set_model_view_channel(ModelViewChannel* channel) { channel_ = channel; }
 
@@ skipping 75 matching lines @@
   ModelViewChannel* channel_;
 
   BaseScreenDelegate* base_screen_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(BaseScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_BASE_SCREEN_H_