Use IOSImageDataFetcherWrapper for favicon

components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h

Index: components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h
diff --git a/components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h b/components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h
index 81b5f70dbdfccfb4c9b31f2289a0bb31ca6eae3c..b403b443d3b60586e5117d5eb713eba9622291ff 100644
--- a/components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h
+++ b/components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h
@@ -23,8 +23,10 @@ class GURL;
 
 namespace image_fetcher {
 
-// Callback that informs of the download of an image encoded in |data|.
-using IOSImageDataFetcherCallback = void (^)(NSData* data);
+// Callback that informs of the download of an image encoded in |data| with the
+// http |response_code| of the download. If an error prevented a http response,
+// |http_response_code| will be RESPONSE_CODE_INVALID.
+using IOSImageDataFetcherCallback = void (^)(NSData* data, int response_code);
 
 class IOSImageDataFetcherWrapper {
  public: