cros: Remove unused method

chrome/browser/chromeos/login/screens/arc_terms_of_service_screen.h

 // Copyright 2016 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_ARC_TERMS_OF_SERVICE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_ARC_TERMS_OF_SERVICE_SCREEN_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "chrome/browser/chromeos/login/screens/arc_terms_of_service_screen_actor.h"
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
 
 namespace chromeos {
 
 class BaseScreenDelegate;
 
 class ArcTermsOfServiceScreen : public BaseScreen,
                                 public ArcTermsOfServiceScreenActor::Delegate {
  public:
   ArcTermsOfServiceScreen(BaseScreenDelegate* base_screen_delegate,
                           ArcTermsOfServiceScreenActor* actor);
   ~ArcTermsOfServiceScreen() override;
 
   // BaseScreen:
-  void PrepareToShow() override;
   void Show() override;
   void Hide() override;
   std::string GetName() const override;
 
   // ArcTermsOfServiceScreenActor::Delegate:
   void OnSkip() override;
   void OnAccept() override;
   void OnActorDestroyed(ArcTermsOfServiceScreenActor* actor) override;
 
  private:
   void ApplyTerms(bool accepted);
 
   ArcTermsOfServiceScreenActor* actor_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcTermsOfServiceScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_ARC_TERMS_OF_SERVICE_SCREEN_H_