ScreenObserver is renamed to BaseScreenDelegate.

chrome/browser/chromeos/login/screens/controller_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_CONTROLLER_PAIRING_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_CONTROLLER_PAIRING_SCREEN_H_
 
 #include "base/macros.h"
 
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
@@ skipping 10 matching lines @@
  public:
   class Delegate {
    public:
     virtual ~Delegate() {}
 
     // Set remora configuration from shark.
     virtual void SetHostConfiguration() = 0;
   };
 
   ControllerPairingScreen(
-      ScreenObserver* observer,
+      BaseScreenDelegate* base_screen_delegate,
       ControllerPairingScreenActor* actor,
       pairing_chromeos::ControllerPairingController* shark_controller);
   virtual ~ControllerPairingScreen();
 
   void SetDelegate(Delegate* delegate);
 
  private:
   typedef pairing_chromeos::ControllerPairingController::Stage Stage;
 
   void CommitContextChanges();
@@ skipping 32 matching lines @@
   // If this one is |false| first device in device list will be preselected on
   // next device list update.
   bool device_preselected_;
 
   DISALLOW_COPY_AND_ASSIGN(ControllerPairingScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_CONTROLLER_PAIRING_SCREEN_H_