Use IOSImageDataFetcherWrapper for favicon

components/favicon/ios/web_favicon_driver.h

Index: components/favicon/ios/web_favicon_driver.h
diff --git a/components/favicon/ios/web_favicon_driver.h b/components/favicon/ios/web_favicon_driver.h
index b5209a1b7a0a5067db20c93bb3e054ad3e18fcef..59cfca2e2d074931cee773c3cdc780679366205a 100644
--- a/components/favicon/ios/web_favicon_driver.h
+++ b/components/favicon/ios/web_favicon_driver.h
@@ -7,6 +7,7 @@
 
 #include "base/macros.h"
 #include "components/favicon/core/favicon_driver_impl.h"
+#import "components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 #include "ios/web/public/web_state/web_state_user_data.h"
 
@@ -58,6 +59,9 @@ class WebFaviconDriver : public web::WebStateObserver,
   // The URL passed to FetchFavicon().
   GURL fetch_favicon_url_;
 
+  // Image Fetcher used to fetch favicon.
+  image_fetcher::IOSImageDataFetcherWrapper image_fetcher_;
+
   DISALLOW_COPY_AND_ASSIGN(WebFaviconDriver);
 };