Let ActivityManager delete the remaining activities on shutdown.

athena/athena.gyp

 # Copyright 2014 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': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 16 matching lines @@
         'home/home_card_impl.cc',
         'home/public/home_card.h',
         'screen/background_controller.cc',
         'screen/background_controller.h',
         'screen/public/screen_manager.h',
         'screen/screen_manager_impl.cc',
         'activity/public/activity.h',
         'activity/public/activity_manager.h',
         'activity/public/activity_view_manager.h',
         'activity/public/activity_view_model.h',
+        'activity/activity.cc',
         'activity/activity_manager_impl.cc',
         'activity/activity_view_manager_impl.cc',
         'wm/public/window_manager.h',
         'wm/window_manager_impl.cc',
       ],
     },
     {
       'target_name': 'athena_test_support',
       'type': 'static_library',
       'dependencies': [
@@ skipping 28 matching lines @@
         'athena_test_support',
       ],
       'sources': [
         'test/athena_unittests.cc',
         'wm/window_manager_unittest.cc',
       ],
     }
   ],
 }