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

chrome/browser/ui/zoom/chrome_zoom_level_prefs.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_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_
 #define CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
@@ skipping 34 matching lines @@
       PrefService* pref_service,
       const base::FilePath& profile_path,
       const base::FilePath& partition_path,
       base::WeakPtr<ui_zoom::ZoomEventManager> zoom_event_manager);
   ~ChromeZoomLevelPrefs() override;
 
   static std::string GetHashForTesting(const base::FilePath& relative_path);
 
   void SetDefaultZoomLevelPref(double level);
   double GetDefaultZoomLevelPref() const;
-  scoped_ptr<DefaultZoomLevelSubscription> RegisterDefaultZoomLevelCallback(
-      const base::Closure& callback);
+  std::unique_ptr<DefaultZoomLevelSubscription>
+  RegisterDefaultZoomLevelCallback(const base::Closure& callback);
 
   void ExtractPerHostZoomLevels(
       const base::DictionaryValue* host_zoom_dictionary,
       bool sanitize_partition_host_zoom_levels);
 
   // content::ZoomLevelDelegate
   void InitHostZoomMap(content::HostZoomMap* host_zoom_map) override;
 
  private:
   // This is a callback function that receives notifications from HostZoomMap
   // when per-host zoom levels change. It is used to update the per-host
   // zoom levels (if any) managed by this class (for its associated partition).
   void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change);
 
   PrefService* pref_service_;
   base::WeakPtr<ui_zoom::ZoomEventManager> zoom_event_manager_;
   content::HostZoomMap* host_zoom_map_;
-  scoped_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
+  std::unique_ptr<content::HostZoomMap::Subscription> zoom_subscription_;
   std::string partition_key_;
   base::CallbackList<void(void)> default_zoom_changed_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeZoomLevelPrefs);
 };
 
 #endif  // CHROME_BROWSER_UI_ZOOM_CHROME_ZOOM_LEVEL_PREFS_H_