Use IOSImageDataFetcherWrapper for favicon

components/image_fetcher/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 COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_
 #define COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_
 
 #include <map>
 #include <memory>
 #include <string>
@@ skipping 58 matching lines @@
     std::string id;
     // Queue for pending callbacks, which may accumulate while the request is in
     // flight.
     CallbackVector callbacks;
   };
 
   using ImageRequestMap = std::map<const GURL, ImageRequest>;
 
   // Processes image URL fetched events. This is the continuation method used
   // for creating callbacks that are passed to the ImageDataFetcher.
-  void OnImageURLFetched(const GURL& image_url, const std::string& image_data);
+  void OnImageURLFetched(const GURL& image_url,
+                         const std::string& image_data,
+                         int http_response_code);
 
   // Processes image decoded events. This is the continuation method used for
   // creating callbacks that are passed to the ImageDecoder.
   void OnImageDecoded(const GURL& image_url, const gfx::Image& image);
 
 
   ImageFetcherDelegate* delegate_;
 
   scoped_refptr<net::URLRequestContextGetter> url_request_context_;
 
   std::unique_ptr<ImageDecoder> image_decoder_;
 
   std::unique_ptr<ImageDataFetcher> image_data_fetcher_;
 
   // Map from each image URL to the request information (associated website
   // url, fetcher, pending callbacks).
   ImageRequestMap pending_net_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageFetcherImpl);
 };
 
 }  // namespace image_fetcher
 
 #endif  // COMPONENTS_IMAGE_FETCHER_IMAGE_FETCHER_IMPL_H_