cros: Remove unused method

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

 // Copyright (c) 2013 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_TERMS_OF_SERVICE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_TERMS_OF_SERVICE_SCREEN_H_
 
 #include <memory>
 
 #include "base/compiler_specific.h"
@@ skipping 17 matching lines @@
 // for public sessions only.
 class TermsOfServiceScreen : public BaseScreen,
                              public TermsOfServiceScreenActor::Delegate,
                              public net::URLFetcherDelegate {
  public:
   TermsOfServiceScreen(BaseScreenDelegate* base_screen_delegate,
                        TermsOfServiceScreenActor* actor);
   ~TermsOfServiceScreen() override;
 
   // BaseScreen:
-  void PrepareToShow() override;
   void Show() override;
   void Hide() override;
   std::string GetName() const override;
 
   // TermsOfServiceScreenActor::Delegate:
   void OnDecline() override;
   void OnAccept() override;
   void OnActorDestroyed(TermsOfServiceScreenActor* actor) override;
 
  private:
@@ skipping 13 matching lines @@
   // Timer that enforces a custom (shorter) timeout on the attempt to download
   // the Terms of Service.
   base::OneShotTimer download_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(TermsOfServiceScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_TERMS_OF_SERVICE_SCREEN_H_