Move download filename determintion into a separate class.

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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 433 matching lines @@
         'browser/download/chrome_download_manager_delegate.h',
         'browser/download/download_completion_blocker.cc',
         'browser/download/download_completion_blocker.h',
         'browser/download/download_crx_util.cc',
         'browser/download/download_crx_util.h',
         'browser/download/download_crx_util_android.cc',
         'browser/download/download_extensions.cc',
         'browser/download/download_extensions.h',
         'browser/download/download_file_picker.cc',
         'browser/download/download_file_picker.h',
-        'browser/download/download_file_picker_chromeos.cc',
-        'browser/download/download_file_picker_chromeos.h',
         'browser/download/download_history.cc',
         'browser/download/download_history.h',
         'browser/download/download_item_model.cc',
         'browser/download/download_item_model.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',
@@ skipping 12 matching lines @@
         '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_gtk.cc',
         'browser/download/download_status_updater_mac.mm',
         'browser/download/download_status_updater_win.cc',
+        'browser/download/download_target_determiner.cc',
+        'browser/download/download_target_determiner.h',
+        'browser/download/download_target_determiner_delegate.h',
         'browser/download/download_ui_controller.cc',
         'browser/download/download_ui_controller.h',
         'browser/download/download_util.cc',
         'browser/download/download_util.h',
         'browser/download/all_download_item_notifier.cc',
         'browser/download/all_download_item_notifier.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',
@@ skipping 2593 matching lines @@
             'package_name': 'org/chromium/chrome/browser/ui/toolbar',
             'template_deps': ['browser/ui/toolbar/toolbar_model_security_level_list.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }