Revert of Refactor backdrop

ash/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 # Historical note: Ash shipped on Windows for a couple years to support
@@ skipping 640 matching lines @@
     "wm/immersive_gesture_handler_aura.h",
     "wm/immersive_handler_factory_ash.cc",
     "wm/immersive_handler_factory_ash.h",
     "wm/lock_layout_manager.cc",
     "wm/lock_layout_manager.h",
     "wm/lock_state_controller.cc",
     "wm/lock_state_controller.h",
     "wm/lock_state_observer.h",
     "wm/lock_window_state.cc",
     "wm/lock_window_state.h",
-    "wm/maximize_mode/maximize_mode_backdrop_delegate_impl.cc",
-    "wm/maximize_mode/maximize_mode_backdrop_delegate_impl.h",
     "wm/maximize_mode/maximize_mode_controller.cc",
     "wm/maximize_mode/maximize_mode_controller.h",
     "wm/maximize_mode/maximize_mode_event_handler.cc",
     "wm/maximize_mode/maximize_mode_event_handler.h",
     "wm/maximize_mode/maximize_mode_event_handler_aura.cc",
     "wm/maximize_mode/maximize_mode_event_handler_aura.h",
     "wm/maximize_mode/maximize_mode_window_manager.cc",
     "wm/maximize_mode/maximize_mode_window_manager.h",
     "wm/maximize_mode/maximize_mode_window_state.cc",
     "wm/maximize_mode/maximize_mode_window_state.h",
     "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard.h",
     "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_ozone.cc",
     "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_ozone.h",
     "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.cc",
     "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h",
+    "wm/maximize_mode/workspace_backdrop_delegate.cc",
+    "wm/maximize_mode/workspace_backdrop_delegate.h",
     "wm/mru_window_tracker.cc",
     "wm/mru_window_tracker.h",
     "wm/overlay_event_filter.cc",
     "wm/overlay_event_filter.h",
     "wm/overview/cleanup_animation_observer.cc",
     "wm/overview/cleanup_animation_observer.h",
     "wm/overview/overview_animation_type.h",
     "wm/overview/scoped_overview_animation_settings.h",
     "wm/overview/scoped_overview_animation_settings_aura.cc",
     "wm/overview/scoped_overview_animation_settings_aura.h",
@@ skipping 99 matching lines @@
     "wm/wm_event.cc",
     "wm/wm_event.h",
     "wm/wm_snap_to_pixel_layout_manager.cc",
     "wm/wm_snap_to_pixel_layout_manager.h",
     "wm/wm_toplevel_window_event_handler.cc",
     "wm/wm_toplevel_window_event_handler.h",
     "wm/wm_types.cc",
     "wm/wm_types.h",
     "wm/wm_window_animations.cc",
     "wm/wm_window_animations.h",
-    "wm/workspace/backdrop_controller.cc",
-    "wm/workspace/backdrop_controller.h",
-    "wm/workspace/backdrop_delegate.h",
     "wm/workspace/magnetism_matcher.cc",
     "wm/workspace/magnetism_matcher.h",
     "wm/workspace/multi_window_resize_controller.cc",
     "wm/workspace/multi_window_resize_controller.h",
     "wm/workspace/phantom_window_controller.cc",
     "wm/workspace/phantom_window_controller.h",
     "wm/workspace/two_step_edge_cycler.cc",
     "wm/workspace/two_step_edge_cycler.h",
     "wm/workspace/workspace_event_handler.cc",
     "wm/workspace/workspace_event_handler.h",
     "wm/workspace/workspace_event_handler_aura.cc",
     "wm/workspace/workspace_event_handler_aura.h",
     "wm/workspace/workspace_layout_manager.cc",
     "wm/workspace/workspace_layout_manager.h",
+    "wm/workspace/workspace_layout_manager_backdrop_delegate.h",
     "wm/workspace/workspace_types.h",
     "wm/workspace/workspace_window_resizer.cc",
     "wm/workspace/workspace_window_resizer.h",
     "wm/workspace_controller.cc",
     "wm/workspace_controller.h",
     "wm_display_observer.h",
     "wm_transient_window_observer.h",
     "wm_window.cc",
     "wm_window.h",
   ]
@@ skipping 688 matching lines @@
     "//content/public/app:both",
     "//device/bluetooth",
   ]
 
   data_deps = [
     "//ash/strings:ash_test_strings",
     "//ash/resources:ash_test_resources_with_content_100_percent",
     "//ash/resources:ash_test_resources_200_percent",
   ]
 }