Mountain Lion: use the system download progress.

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 1051 matching lines @@
         'browser/download/download_danger_prompt.h',
         'browser/download/download_shelf.h',
         'browser/download/download_shelf.cc',
         'browser/download/download_shelf_context_menu.cc',
         'browser/download/download_shelf_context_menu.h',
         'browser/download/download_started_animation.h',
         'browser/download/download_resource_throttle.cc',
         'browser/download/download_resource_throttle.h',
         'browser/download/download_status_updater.cc',
         'browser/download/download_status_updater.h',
+        'browser/download/download_status_updater_mac.mm',
         'browser/download/download_util.cc',
         'browser/download/download_util.h',
         'browser/download/save_package_file_picker.cc',
         'browser/download/save_package_file_picker.h',
         'browser/download/save_package_file_picker_chromeos.cc',
         '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',
@@ skipping 4458 matching lines @@
           'includes': [ '../build/jni_generator.gypi' ],
           'dependencies': [
             'android_jar_jni_headers',
           ],
         },
       ],
      },
     ],
   ],
 }