Renames WmWindowUserData and converts to using aura

ash/BUILD.gn

Index: ash/BUILD.gn
diff --git a/ash/BUILD.gn b/ash/BUILD.gn
index 69396a92650fe0dfaf2daa2f92b744e4faf4579a..221d41c8149b06d1d8fbb54d56f872e76e76bffa 100644
--- a/ash/BUILD.gn
+++ b/ash/BUILD.gn
@@ -453,6 +453,7 @@ component("ash") {
     "common/wallpaper/wallpaper_view.h",
     "common/wallpaper/wallpaper_widget_controller.cc",
     "common/wallpaper/wallpaper_widget_controller.h",
+    "common/window_user_data.h",
     "common/wm/always_on_top_controller.cc",
     "common/wm/always_on_top_controller.h",
     "common/wm/container_finder.cc",
@@ -584,7 +585,6 @@ component("ash") {
     "common/wm_transient_window_observer.h",
     "common/wm_window.cc",
     "common/wm_window.h",
-    "common/wm_window_user_data.h",
     "debug.cc",
     "debug.h",
     "default_wallpaper_delegate.cc",
@@ -1199,12 +1199,12 @@ source_set("common_unittests") {
     "common/system/update/tray_update_unittest.cc",
     "common/system/user/tray_user_unittest.cc",
     "common/wallpaper/wallpaper_controller_unittest.cc",
+    "common/window_user_data_unittest.cc",
     "common/wm/container_finder_unittest.cc",
     "common/wm/mru_window_tracker_unittest.cc",
     "common/wm/overview/cleanup_animation_observer_unittest.cc",
     "common/wm/workspace/workspace_layout_manager_unittest.cc",
     "common/wm_window_unittest.cc",
-    "common/wm_window_user_data_unittest.cc",
     "first_run/first_run_helper_unittest.cc",
     "focus_cycler_unittest.cc",
     "frame/caption_buttons/frame_size_button_unittest.cc",