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

chrome/browser/chromeos/login/screens/update_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_UPDATE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_UPDATE_SCREEN_H_
 
 #include <set>
 
 #include "base/callback.h"
@@ skipping 159 matching lines @@
   double download_average_speed_;
 
   // True if there was no notification from NetworkPortalDetector
   // about state for the default network.
   bool is_first_detection_notification_;
 
   // True if there was no notification about captive portal state for
   // the default network.
   bool is_first_portal_notification_;
 
-  scoped_ptr<ErrorScreensHistogramHelper> histogram_helper_;
+  std::unique_ptr<ErrorScreensHistogramHelper> histogram_helper_;
 
   // Timer for the captive portal detector to show portal login page.
   // If redirect did not happen during this delay, error message is shown
   // instead.
   base::OneShotTimer error_message_timer_;
 
   ErrorScreen::ConnectRequestCallbackSubscription connect_request_subscription_;
 
   base::WeakPtrFactory<UpdateScreen> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_UPDATE_SCREEN_H_