Treat touch icons just like non-touch icons on mobile

components/favicon/core/favicon_driver_impl.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_CORE_FAVICON_DRIVER_IMPL_H_
 #define COMPONENTS_FAVICON_CORE_FAVICON_DRIVER_IMPL_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 57 matching lines @@
   FaviconService* favicon_service() { return favicon_service_; }
 
  private:
   // KeyedServices used by FaviconDriverImpl. They may be null during testing,
   // but if they are defined, they must outlive the FaviconDriverImpl.
   FaviconService* favicon_service_;
   history::HistoryService* history_service_;
   bookmarks::BookmarkModel* bookmark_model_;
 
   // FaviconHandlers used to download the different kind of favicons.
-  // |touch_icon_handler_| may be null depending on the platform and variations.
   std::unique_ptr<FaviconHandler> favicon_handler_;
-  std::unique_ptr<FaviconHandler> touch_icon_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconDriverImpl);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CORE_FAVICON_DRIVER_IMPL_H_