cros: Remove unused method

chrome/browser/chromeos/login/screens/app_launch_splash_screen_actor.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_CHROMEOS_LOGIN_SCREENS_APP_LAUNCH_SPLASH_SCREEN_ACTOR_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_APP_LAUNCH_SPLASH_SCREEN_ACTOR_H_
 
 #include "base/strings/string16.h"
 
 namespace chromeos {
@@ skipping 28 matching lines @@
 
    protected:
     virtual ~Delegate() {}
   };
 
   virtual ~AppLaunchSplashScreenActor() {}
 
   // Sets screen this actor belongs to.
   virtual void SetDelegate(Delegate* screen) = 0;
 
-  // Prepare the contents to showing.
-  virtual void PrepareToShow() = 0;
-
   // Shows the contents of the screen.
   virtual void Show(const std::string& app_id) = 0;
 
   // Hides the contents of the screen.
   virtual void Hide() = 0;
 
   // Set the current app launch state.
   virtual void UpdateAppLaunchState(AppLaunchState state) = 0;
 
   // Sets whether configure network control is visible.
   virtual void ToggleNetworkConfig(bool visible) = 0;
 
   // Shows the network error and configure UI.
   virtual void ShowNetworkConfigureUI() = 0;
 
   // Returns true if the default network has Internet access.
   virtual bool IsNetworkReady() = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_APP_LAUNCH_SPLASH_SCREEN_ACTOR_H_