Convert //chrome/browser/chromeos from scoped_ptr to std::unique_ptr

chrome/browser/chromeos/power/power_button_observer.cc

 // 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.
 
 #include "chrome/browser/chromeos/power/power_button_observer.h"
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray_delegate.h"
 #include "ash/system/user/login_status.h"
 #include "ash/wm/power_button_controller.h"
@@ skipping 18 matching lines @@
   return ash::Shell::GetInstance()->system_tray_delegate()->
       GetUserLoginStatus();
 }
 
 }  // namespace
 
 PowerButtonObserver::PowerButtonObserver() {
   // TODO: Remove after resolving crbug.com/452599.
   VLOG(0) << "Creating PowerButtonObserver " << this;
 
-  ash::Shell::GetInstance()->lock_state_controller()->
-      SetDelegate(scoped_ptr<ash::LockStateControllerDelegate>(
+  ash::Shell::GetInstance()->lock_state_controller()->SetDelegate(
+      std::unique_ptr<ash::LockStateControllerDelegate>(
           new SessionStateControllerDelegateChromeos));
 
   registrar_.Add(
       this,
       chrome::NOTIFICATION_LOGIN_USER_CHANGED,
       content::NotificationService::AllSources());
   registrar_.Add(
       this,
       chrome::NOTIFICATION_APP_TERMINATING,
       content::NotificationService::AllSources());
@@ skipping 45 matching lines @@
   }
 }
 
 void PowerButtonObserver::PowerButtonEventReceived(
     bool down, const base::TimeTicks& timestamp) {
   ash::Shell::GetInstance()->power_button_controller()->
       OnPowerButtonEvent(down, timestamp);
 }
 
 }  // namespace chromeos