Remove remainder of USE_ATHENA ifdefs

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'variables': {
     # There are two sections of sources:
     # * "Platform"-based sources (OS, toolkit, etc.)
     # * Feature/directory-based sources (e.g., history, printing)
 
@@ skipping 1243 matching lines @@
     ],
     # Used when athena is enabled.
     'chrome_browser_ui_athena_sources': [
       #TODO(mukai): Port AppListService to Athena (crbug.com/417571)
       'browser/ui/app_list/app_list_service_disabled.cc',
 
       'browser/ui/athena/extensions/application_launch_web_app_athena.cc',
       'browser/ui/athena/extensions/extension_install_ui_factory_athena.cc',
       'browser/ui/views/athena/athena_util.cc',
       'browser/ui/views/athena/athena_util.h',
-      'browser/ui/views/athena/chrome_browser_main_extra_parts_athena.cc',
-      'browser/ui/views/athena/chrome_browser_main_extra_parts_athena.h',
     ],
     # Used when not using mobile and not using Athena.
     'chrome_browser_ui_non_athena_non_mobile_sources': [
       'browser/ui/extensions/application_launch_web_app.cc',
       'browser/ui/extensions/extension_install_ui_factory.cc',
       'browser/ui/webui/chromeos/keyboard_overlay_ui.cc',
       'browser/ui/webui/chromeos/keyboard_overlay_ui.h',
       'browser/ui/webui/chromeos/first_run/first_run_ui.cc',
       'browser/ui/webui/chromeos/first_run/first_run_ui.h',
       'browser/ui/webui/options/chromeos/display_options_handler.cc',
@@ skipping 1877 matching lines @@
           ],
           'sources': [
             '<@(chrome_browser_ui_non_mobile_sources)',
             '<@(chrome_browser_ui_omnibox_non_mobile_sources)',
           ],
         }],
       ],
     },
   ],
 }