Use aura::WindowProperty for title and name strings.

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 68408041f11c7f800f810c259b1feffa7b15cb7c..ba5b07a78b74112487d00162e3f39f343db59b9e 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -103,10 +103,10 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   int id() const { return id_; }
   void set_id(int id) { id_ = id; }
 
-  const std::string& name() const { return name_; }
+  const std::string& GetName() const;
   void SetName(const std::string& name);
 
-  const base::string16 title() const { return title_; }
+  const base::string16& GetTitle() const;
   void SetTitle(const base::string16& title);
 
   bool transparent() const { return transparent_; }
@@ -500,9 +500,6 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   bool visible_;
 
   int id_;
-  std::string name_;
-
-  base::string16 title_;
 
   // Whether layer is initialized as non-opaque.
   bool transparent_;