Add support to process favicons from Web Manifests

components/favicon/ios/web_favicon_driver.h

 // Copyright 2015 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_FAVICON_IOS_WEB_FAVICON_DRIVER_H_
 #define COMPONENTS_FAVICON_IOS_WEB_FAVICON_DRIVER_H_
 
 #include "base/macros.h"
 #include "components/favicon/core/favicon_driver_impl.h"
 #import "components/image_fetcher/ios/ios_image_data_fetcher_wrapper.h"
@@ skipping 21 matching lines @@
   // FaviconDriver implementation.
   void FetchFavicon(const GURL& url) override;
   gfx::Image GetFavicon() const override;
   bool FaviconIsValid() const override;
   GURL GetActiveURL() override;
 
   // FaviconHandler::Delegate implementation.
   int DownloadImage(const GURL& url,
                     int max_image_size,
                     ImageDownloadCallback callback) override;
+  void DownloadManifest(const GURL& url,
+                        ManifestDownloadCallback callback) override;
   bool IsOffTheRecord() override;
   void OnFaviconUpdated(
       const GURL& page_url,
       FaviconDriverObserver::NotificationIconType notification_icon_type,
       const GURL& icon_url,
       bool icon_url_changed,
       const gfx::Image& image) override;
 
  private:
   friend class web::WebStateUserData<WebFaviconDriver>;
@@ skipping 13 matching lines @@
 
   // Image Fetcher used to fetch favicon.
   image_fetcher::IOSImageDataFetcherWrapper image_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(WebFaviconDriver);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_IOS_WEB_FAVICON_DRIVER_H_