cros: Remove unused method

chrome/browser/ui/webui/chromeos/login/app_launch_splash_screen_handler.h

 // Copyright 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_UI_WEBUI_CHROMEOS_LOGIN_APP_LAUNCH_SPLASH_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_APP_LAUNCH_SPLASH_SCREEN_HANDLER_H_
 
 #include <set>
 #include <string>
 
@@ skipping 19 matching lines @@
   // BaseScreenHandler implementation:
   void DeclareLocalizedValues(
       ::login::LocalizedValuesBuilder* builder) override;
   void Initialize() override;
 
   // WebUIMessageHandler implementation:
   void RegisterMessages() override;
 
   // AppLaunchSplashScreenActor implementation:
   void Show(const std::string& app_id) override;
-  void PrepareToShow() override;
   void Hide() override;
   void ToggleNetworkConfig(bool visible) override;
   void UpdateAppLaunchState(AppLaunchState state) override;
   void SetDelegate(AppLaunchSplashScreenHandler::Delegate* delegate) override;
   void ShowNetworkConfigureUI() override;
   bool IsNetworkReady() override;
 
   // NetworkStateInformer::NetworkStateInformerObserver implementation:
   void OnNetworkReady() override;
   void UpdateState(NetworkError::ErrorReason reason) override;
@@ skipping 23 matching lines @@
 
   // True if we have manually requested network config screen.
   bool network_config_requested_;
 
   DISALLOW_COPY_AND_ASSIGN(AppLaunchSplashScreenHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_LOGIN_APP_LAUNCH_SPLASH_SCREEN_HANDLER_H_