Convert //ios from scoped_ptr to std::unique_ptr.

ios/chrome/browser/favicon/favicon_loader.h

 // Copyright 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 IOS_CHROME_BROWSER_FAVICON_FAVICON_LOADER_H_
 #define IOS_CHROME_BROWSER_FAVICON_FAVICON_LOADER_H_
 
+#include <memory>
 #include <vector>
 
 #import "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/task/cancelable_task_tracker.h"
 #include "base/threading/thread_checker.h"
 #include "components/favicon_base/favicon_types.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 class GURL;
 @class NSMutableDictionary;
 @class UIImage;
 
 namespace favicon {
@@ skipping 23 matching lines @@
 
   // Purges the cache, in response to low-memory.
   void PurgeCache();
 
  private:
   struct RequestData;
 
   // Called when the favicon load request completes. Saves image into the
   // cache. Desktop code assumes this image is in PNG format.
   void OnFaviconAvailable(
-      scoped_ptr<RequestData> request_data,
+      std::unique_ptr<RequestData> request_data,
       const std::vector<favicon_base::FaviconRawBitmapResult>&
           favicon_bitmap_results);
 
   base::ThreadChecker thread_checker_;
 
   // The FaviconService used to retrieve favicon; may be null during testing.
   // Must outlive the FaviconLoader.
   favicon::FaviconService* favicon_service_;
 
   // Tracks tasks sent to FaviconService.
   base::CancelableTaskTracker cancelable_task_tracker_;
 
   // Holds cached favicons. This dictionary is populated as favicons are
   // retrieved from the FaviconService. This will be emptied during low-memory
   // conditions. Keyed by NSString of URL spec.
   base::scoped_nsobject<NSMutableDictionary> favicon_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconLoader);
 };
 
 #endif  // IOS_CHROME_BROWSER_FAVICON_FAVICON_LOADER_H_