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

ios/chrome/browser/net/image_fetcher.mm

 // Copyright 2012 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.
 
 #import "ios/chrome/browser/net/image_fetcher.h"
 
 #import <Foundation/Foundation.h>
 #include <stddef.h>
 
 #include "base/bind.h"
@@ skipping 94 matching lines @@
 // Delegate callback that is called when URLFetcher completes.  If the image
 // was fetched successfully, creates a new NSData and returns it to the
 // callback, otherwise returns nil to the callback.
 void ImageFetcher::OnURLFetchComplete(const net::URLFetcher* fetcher) {
   if (downloads_in_progress_.find(fetcher) == downloads_in_progress_.end()) {
     LOG(ERROR) << "Received callback for unknown URLFetcher " << fetcher;
     return;
   }
 
   // Ensures that |fetcher| will be deleted in the event of early return.
-  scoped_ptr<const net::URLFetcher> fetcher_deleter(fetcher);
+  std::unique_ptr<const net::URLFetcher> fetcher_deleter(fetcher);
 
   // Retrieves the callback and ensures that it will be deleted in the event
   // of early return.
   base::mac::ScopedBlock<ImageFetchedCallback> callback(
       downloads_in_progress_[fetcher]);
 
   // Remove |fetcher| from the map.
   downloads_in_progress_.erase(fetcher);
 
   // Make sure the request was successful. For "data" requests, the response
@@ skipping 43 matching lines @@
     NSData* data) {
   (callback.get())(url, http_response_code, data);
 }
 
 void ImageFetcher::SetRequestContextGetter(
     const scoped_refptr<net::URLRequestContextGetter>& request_context_getter) {
   request_context_getter_ = request_context_getter;
 }
 
 }  // namespace image_fetcher