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

chrome/browser/chromeos/app_mode/kiosk_app_external_loader.cc

 // 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.
 
 #include "chrome/browser/chromeos/app_mode/kiosk_app_external_loader.h"
 
 #include <utility>
 
 #include "base/values.h"
 #include "chrome/browser/chromeos/app_mode/kiosk_app_manager.h"
 
 namespace chromeos {
 
 KioskAppExternalLoader::KioskAppExternalLoader() {
 }
 
 KioskAppExternalLoader::~KioskAppExternalLoader() {
 }
 
 void KioskAppExternalLoader::SetCurrentAppExtensions(
-    scoped_ptr<base::DictionaryValue> prefs) {
+    std::unique_ptr<base::DictionaryValue> prefs) {
   prefs_ = std::move(prefs);
   StartLoading();
 }
 
 void KioskAppExternalLoader::StartLoading() {
   if (prefs_)
     LoadFinished();
 }
 
 }  // namespace chromeos