Stop compiling dead download infobar code on desktop Chrome

chrome/chrome_browser.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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 424 matching lines @@
       'browser/download/download_item_model.cc',
       'browser/download/download_item_model.h',
       'browser/download/download_path_reservation_tracker.cc',
       'browser/download/download_path_reservation_tracker.h',
       'browser/download/download_permission_request.cc',
       'browser/download/download_permission_request.h',
       'browser/download/download_prefs.cc',
       'browser/download/download_prefs.h',
       'browser/download/download_query.cc',
       'browser/download/download_query.h',
-      'browser/download/download_request_infobar_delegate.cc',
-      'browser/download/download_request_infobar_delegate.h',
       'browser/download/download_request_limiter.cc',
       'browser/download/download_request_limiter.h',
       'browser/download/download_resource_throttle.cc',
       'browser/download/download_resource_throttle.h',
       'browser/download/download_service.cc',
       'browser/download/download_service.h',
       'browser/download/download_service_factory.cc',
       'browser/download/download_service_factory.h',
       'browser/download/download_service_impl.cc',
       'browser/download/download_service_impl.h',
@@ skipping 397 matching lines @@
       'browser/translate/translate_service.cc',
       'browser/translate/translate_service.h',
       'browser/update_client/chrome_update_query_params_delegate.cc',
       'browser/update_client/chrome_update_query_params_delegate.h',
       'browser/upgrade_detector.cc',
       'browser/upgrade_detector.h',
       'browser/web_data_service_factory.cc',
       'browser/web_data_service_factory.h',
     ],
     'chrome_browser_android_sources': [
+      'browser/download/download_request_infobar_delegate.cc',
+      'browser/download/download_request_infobar_delegate.h',
       'browser/media/protected_media_identifier_infobar_delegate.cc',
       'browser/media/protected_media_identifier_infobar_delegate.h',
       'browser/media/protected_media_identifier_permission_context.cc',
       'browser/media/protected_media_identifier_permission_context.h',
       'browser/media/protected_media_identifier_permission_context_factory.cc',
       'browser/media/protected_media_identifier_permission_context_factory.h',
       'browser/metrics/android_metrics_provider.cc',
       'browser/metrics/android_metrics_provider.h',
       'browser/password_manager/account_chooser_infobar_delegate_android.cc',
       'browser/password_manager/account_chooser_infobar_delegate_android.h',
@@ skipping 3241 matching lines @@
             '../components/components.gyp:omnibox_browser',
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
           ],
         },
       ],
     }],
   ],
 }