ScreenObserver is renamed to BaseScreenDelegate.

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

 // Copyright 2014 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_HOST_PAIRING_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_HOST_PAIRING_SCREEN_H_
 
 #include "base/macros.h"
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
 #include "chrome/browser/chromeos/login/screens/host_pairing_screen_actor.h"
@@ skipping 10 matching lines @@
   class Delegate {
    public:
     virtual ~Delegate() {}
     virtual void ConfigureHost(bool accepted_eula,
                                const std::string& lang,
                                const std::string& timezone,
                                bool send_reports,
                                const std::string& keyboard_layout) = 0;
   };
 
-  HostPairingScreen(ScreenObserver* observer, HostPairingScreenActor* actor,
+  HostPairingScreen(BaseScreenDelegate* base_screen_delegate,
+                    HostPairingScreenActor* actor,
                     pairing_chromeos::HostPairingController* remora_controller);
   virtual ~HostPairingScreen();
 
   void SetDelegate(Delegate* delegate);
 
  private:
   typedef pairing_chromeos::HostPairingController::Stage Stage;
 
   void CommitContextChanges();
 
@@ skipping 28 matching lines @@
 
   // Current stage of pairing process.
   Stage current_stage_;
 
   DISALLOW_COPY_AND_ASSIGN(HostPairingScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_HOST_PAIRING_SCREEN_H_