Extract Favicon Download logic from FaviconTabHelper

chrome/chrome_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
@@ skipping 604 matching lines @@
         'browser/download/save_package_file_picker_chromeos.h',
         'browser/enumerate_modules_model_win.cc',
         'browser/enumerate_modules_model_win.h',
         'browser/event_disposition.cc',
         'browser/event_disposition.h',
         'browser/external_protocol/external_protocol_handler.cc',
         'browser/external_protocol/external_protocol_handler.h',
         'browser/external_protocol/external_protocol_observer.cc',
         'browser/external_protocol/external_protocol_observer.h',
         'browser/external_tab/external_tab_container.h',
+        'browser/favicon/favicon_download_helper.cc',
+        'browser/favicon/favicon_download_helper.h',
+        'browser/favicon/favicon_download_helper_delegate.h',
         'browser/favicon/favicon_handler.cc',
         'browser/favicon/favicon_handler.h',
         'browser/favicon/favicon_handler_delegate.h',
         'browser/favicon/favicon_service.cc',
         'browser/favicon/favicon_service.h',
         'browser/favicon/favicon_service_factory.cc',
         'browser/favicon/favicon_service_factory.h',
         'browser/favicon/favicon_tab_helper.cc',
         'browser/favicon/favicon_tab_helper.h',
         'browser/favicon/favicon_util.cc',
@@ skipping 2344 matching lines @@
             'proto_in_dir': '../third_party/cros_system_api/dbus',
             'proto_out_dir': 'chrome/browser/media_transfer_protocol',
           },
           'includes': ['../build/protoc.gypi'],
         },
       ],
      },
     ],
   ],
 }