Refactor and push window properties up to class properties.

ui/aura/mus/window_port_mus.cc

Index: ui/aura/mus/window_port_mus.cc
diff --git a/ui/aura/mus/window_port_mus.cc b/ui/aura/mus/window_port_mus.cc
index 8fdf62b0de3c66c053ea0ab8b80a653273b4e9fd..12db96881a545241444e76834d9164a9cd5a0ddc 100644
--- a/ui/aura/mus/window_port_mus.cc
+++ b/ui/aura/mus/window_port_mus.cc
@@ -14,7 +14,7 @@
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_observer.h"
-#include "ui/aura/window_property.h"
+#include "ui/base/class_property.h"
 
 namespace aura {
 
@@ -415,14 +415,14 @@ void WindowPortMus::OnDidChangeBounds(const gfx::Rect& old_bounds,
     window_tree_client_->OnWindowMusBoundsChanged(this, old_bounds, new_bounds);
 }
 
-std::unique_ptr<WindowPortPropertyData> WindowPortMus::OnWillChangeProperty(
+std::unique_ptr<ui::PropertyData> WindowPortMus::OnWillChangeProperty(
     const void* key) {
   return window_tree_client_->OnWindowMusWillChangeProperty(this, key);
 }
 
 void WindowPortMus::OnPropertyChanged(
     const void* key,
-    std::unique_ptr<WindowPortPropertyData> data) {
+    std::unique_ptr<ui::PropertyData> data) {
   ServerChangeData change_data;
   change_data.property_name =
       GetPropertyConverter()->GetTransportNameForPropertyKey(key);