Makes aura::LayoutManager be destroyed before properties

ui/aura/window.cc

Index: ui/aura/window.cc
diff --git a/ui/aura/window.cc b/ui/aura/window.cc
index 0b405d21f924e19790a56d42193a95fad541da4e..845373aa8baa3b7a75262ba6830075cbfc97d994 100644
--- a/ui/aura/window.cc
+++ b/ui/aura/window.cc
@@ -150,6 +150,10 @@ Window::~Window() {
     observer->OnWindowDestroyed(this);
   }
 
+  // Delete the LayoutManager before properties. This way if the LayoutManager
+  // depends upon properties existing the properties are still valid.
+  layout_manager_.reset();
+
   // Clear properties.
   for (std::map<const void*, Value>::const_iterator iter = prop_map_.begin();
        iter != prop_map_.end();