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

chrome/browser/chromeos/arc/arc_settings_service.h

 // Copyright (c) 2015 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_ARC_ARC_SETTINGS_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_ARC_ARC_SETTINGS_SERVICE_H_
 
+#include <memory>
+
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/arc/arc_bridge_service.h"
 #include "components/arc/arc_service.h"
 
 namespace arc {
 
 class ArcSettingsServiceImpl;
 
 class ArcSettingsService : public ArcService,
                            public ArcBridgeService::Observer {
  public:
   explicit ArcSettingsService(ArcBridgeService* bridge_service);
   ~ArcSettingsService() override;
 
   // ArcBridgeService::Observer
   void OnIntentHelperInstanceReady() override;
   void OnIntentHelperInstanceClosed() override;
 
  private:
-  scoped_ptr<ArcSettingsServiceImpl> impl_;
+  std::unique_ptr<ArcSettingsServiceImpl> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcSettingsService);
 };
 
 }  // namespace arc
 
 #endif  // CHROME_BROWSER_CHROMEOS_ARC_ARC_SETTINGS_SERVICE_H_