Use IOSImageDataFetcherWrapper for favicon

components/image_fetcher/image_data_fetcher.cc

 // Copyright 2016 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.
 
 #include "components/image_fetcher/image_data_fetcher.h"
 
 #include "net/base/load_flags.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/url_fetcher.h"
@@ skipping 64 matching lines @@
   pending_requests_[request->url_fetcher.get()] = std::move(request);
 }
 
 void ImageDataFetcher::OnURLFetchComplete(const net::URLFetcher* source) {
   auto request_iter = pending_requests_.find(source);
   DCHECK(request_iter != pending_requests_.end());
 
   bool success = source->GetStatus().status() == net::URLRequestStatus::SUCCESS;
 
   RequestMetadata metadata;
+  metadata.response_code = RESPONSE_CODE_INVALID;
   if (success && source->GetResponseHeaders()) {
     source->GetResponseHeaders()->GetMimeType(&metadata.mime_type);
-    success &= (source->GetResponseHeaders()->response_code() == net::HTTP_OK);
+    metadata.response_code = source->GetResponseHeaders()->response_code();
+    success &= (metadata.response_code == net::HTTP_OK);
   }
 
   std::string image_data;
   if (success) {
     source->GetResponseAsString(&image_data);
   }
   request_iter->second->callback.Run(image_data, metadata);
 
   // Remove the finished request.
   pending_requests_.erase(request_iter);
 }
 
 }  // namespace image_fetcher