Remove ash::ScopedObserverWithDuplicatedSources

ash/ash.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # These files lists are shared with the GN build.
     'ash_sources': [
       'accelerators/accelerator_commands_aura.cc',
@@ skipping 598 matching lines @@
       'rotator/screen_rotation_animation.h',
       'rotator/screen_rotation_animator.cc',
       'rotator/screen_rotation_animator.h',
       'rotator/window_rotation.cc',
       'rotator/window_rotation.h',
       'scoped_target_root_window.cc',
       'scoped_target_root_window.h',
       'screen_util.cc',
       'screen_util.h',
       'screenshot_delegate.h',
-      'shelf/scoped_observer_with_duplicated_sources.h',
       'shelf/shelf.cc',
       'shelf/shelf.h',
       'shelf/shelf_bezel_event_filter.cc',
       'shelf/shelf_bezel_event_filter.h',
       'shelf/shelf_button.cc',
       'shelf/shelf_button.h',
       'shelf/shelf_button_pressed_metric_tracker.cc',
       'shelf/shelf_button_pressed_metric_tracker.h',
       'shelf/shelf_icon_observer.h',
       'shelf/shelf_layout_manager.cc',
@@ skipping 337 matching lines @@
       'frame/default_header_painter_unittest.cc',
       'host/ash_window_tree_host_x11_unittest.cc',
       'magnifier/magnification_controller_unittest.cc',
       'metrics/desktop_task_switch_metric_recorder_unittest.cc',
       'metrics/task_switch_metrics_recorder_unittest.cc',
       'metrics/task_switch_time_tracker_unittest.cc',
       'metrics/user_metrics_recorder_unittest.cc',
       'root_window_controller_unittest.cc',
       'rotator/screen_rotation_animation_unittest.cc',
       'screen_util_unittest.cc',
-      'shelf/scoped_observer_with_duplicated_sources_unittest.cc',
       'shelf/shelf_button_pressed_metric_tracker_unittest.cc',
       'shelf/shelf_layout_manager_unittest.cc',
       'shelf/shelf_tooltip_manager_unittest.cc',
       'shelf/shelf_unittest.cc',
       'shelf/shelf_view_unittest.cc',
       'shelf/shelf_widget_unittest.cc',
       'shelf/shelf_window_watcher_unittest.cc',
       'shell_unittest.cc',
       'sticky_keys/sticky_keys_overlay_unittest.cc',
       'sticky_keys/sticky_keys_unittest.cc',
@@ skipping 485 matching lines @@
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }