ScreenObserver is renamed to BaseScreenDelegate.

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

 // Copyright (c) 2012 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_EULA_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_EULA_SCREEN_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 12 matching lines @@
  public:
   class Delegate {
    public:
     virtual ~Delegate() {}
 
     // Whether usage statistics reporting is enabled on EULA screen.
     virtual void SetUsageStatisticsReporting(bool val) = 0;
     virtual bool GetUsageStatisticsReporting() const = 0;
   };
 
-  EulaScreen(ScreenObserver* observer, EulaScreenActor* actor);
+  EulaScreen(BaseScreenDelegate* base_screen_delegate, EulaScreenActor* actor);
   virtual ~EulaScreen();
 
   void SetDelegate(Delegate* delegate);
 
   // BaseScreen implementation:
   virtual void PrepareToShow() override;
   virtual void Show() override;
   virtual void Hide() override;
   virtual std::string GetName() const override;
 
@@ skipping 23 matching lines @@
   Delegate* delegate_;
 
   TpmPasswordFetcher password_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(EulaScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_EULA_SCREEN_H_