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

ios/chrome/browser/suggestions/image_fetcher_impl.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 IOS_CHROME_BROWSER_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_
 #define IOS_CHROME_BROWSER_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_
 
+#include <memory>
+
 #include "base/callback_forward.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "components/suggestions/image_fetcher.h"
 
 class GURL;
 class SkBitmap;
 
 namespace image_fetcher {
 class ImageFetcher;
 }
 
 namespace base {
@@ skipping 16 matching lines @@
   ~ImageFetcherImpl() override;
 
   void SetImageFetcherDelegate(ImageFetcherDelegate* delegate) override;
 
   void StartOrQueueNetworkRequest(
       const GURL& url,
       const GURL& image_url,
       base::Callback<void(const GURL&, const SkBitmap*)> callback) override;
 
  private:
-  scoped_ptr<image_fetcher::ImageFetcher> imageFetcher_;
+  std::unique_ptr<image_fetcher::ImageFetcher> imageFetcher_;
 
   ImageFetcherDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageFetcherImpl);
 };
 
 }  // namespace suggestions
 
 #endif  // IOS_CHROME_BROWSER_SUGGESTIONS_IMAGE_FETCHER_IMPL_H_