[ash-md] Remove the number of animators used for the Shelf animations.

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 443 matching lines @@
     "common/wallpaper/wallpaper_controller.cc",
     "common/wallpaper/wallpaper_controller.h",
     "common/wallpaper/wallpaper_controller_observer.h",
     "common/wallpaper/wallpaper_delegate.h",
     "common/wallpaper/wallpaper_view.cc",
     "common/wallpaper/wallpaper_view.h",
     "common/wallpaper/wallpaper_widget_controller.cc",
     "common/wallpaper/wallpaper_widget_controller.h",
     "common/wm/always_on_top_controller.cc",
     "common/wm/always_on_top_controller.h",
-    "common/wm/background_animator.cc",
-    "common/wm/background_animator.h",
     "common/wm/container_finder.cc",
     "common/wm/container_finder.h",
     "common/wm/default_state.cc",
     "common/wm/default_state.h",
     "common/wm/default_window_resizer.cc",
     "common/wm/default_window_resizer.h",
     "common/wm/dock/docked_window_layout_manager.cc",
     "common/wm/dock/docked_window_layout_manager.h",
     "common/wm/dock/docked_window_layout_manager_observer.h",
     "common/wm/dock/docked_window_resizer.cc",
@@ skipping 943 matching lines @@
     "//content/public/app:both",
     "//device/bluetooth",
   ]
 
   data_deps = [
     "//ash/common/strings:ash_test_strings",
     "//ash/resources:ash_test_resources_with_content_100_percent",
     "//ash/resources:ash_test_resources_200_percent",
   ]
 }