Remove WmWindowProperty

ash/common/wm/panels/panel_layout_manager.cc

Index: ash/common/wm/panels/panel_layout_manager.cc
diff --git a/ash/common/wm/panels/panel_layout_manager.cc b/ash/common/wm/panels/panel_layout_manager.cc
index 964d946e49c53e1935f15e367b26ae6dcfb0f484..ad55bb15c8c09f49ed02e5a93c2c6ff64fcdf885 100644
--- a/ash/common/wm/panels/panel_layout_manager.cc
+++ b/ash/common/wm/panels/panel_layout_manager.cc
@@ -17,8 +17,8 @@
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
-#include "ash/common/wm_window_property.h"
 #include "ash/public/cpp/shell_window_ids.h"
+#include "ash/public/cpp/window_properties.h"
 #include "ash/root_window_controller.h"
 #include "ash/wm/window_properties.h"
 #include "base/auto_reset.h"
@@ -340,7 +340,7 @@ void PanelLayoutManager::OnWindowAddedToLayout(WmWindow* child) {
   if (in_add_window_)
     return;
   base::AutoReset<bool> auto_reset_in_add_window(&in_add_window_, true);
-  if (!child->GetBoolProperty(WmWindowProperty::PANEL_ATTACHED)) {
+  if (!child->aura_window()->GetProperty(kPanelAttachedKey)) {
     // This should only happen when a window is added to panel container as a
     // result of bounds change from within the application during a drag.
     // If so we have already stopped the drag and should reparent the panel