cros: Remove unused method

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

 // 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.
 
 #include "chrome/browser/chromeos/login/screens/arc_terms_of_service_screen.h"
 
 #include "chrome/browser/chromeos/login/screens/base_screen_delegate.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "chrome/browser/metrics/metrics_reporting_state.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 10 matching lines @@
   DCHECK(actor_);
   if (actor_)
     actor_->SetDelegate(this);
 }
 
 ArcTermsOfServiceScreen::~ArcTermsOfServiceScreen() {
   if (actor_)
     actor_->SetDelegate(nullptr);
 }
 
-void ArcTermsOfServiceScreen::PrepareToShow() {}
-
 void ArcTermsOfServiceScreen::Show() {
   if (!actor_)
     return;
 
   // Show the screen.
   actor_->Show();
 }
 
 void ArcTermsOfServiceScreen::Hide() {
   if (actor_)
@@ skipping 20 matching lines @@
   Finish(BaseScreenDelegate::ARC_TERMS_OF_SERVICE_FINISHED);
 }
 
 void ArcTermsOfServiceScreen::OnActorDestroyed(
     ArcTermsOfServiceScreenActor* actor) {
   DCHECK_EQ(actor, actor_);
   actor_ = nullptr;
 }
 
 }  // namespace chromeos