Use aura::WindowProperty for title and name strings.

ui/aura/window.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_AURA_WINDOW_H_
 #define UI_AURA_WINDOW_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 85 matching lines @@
 
   // A type is used to identify a class of Windows and customize behavior such
   // as event handling and parenting.  This field should only be consumed by the
   // shell -- Aura itself shouldn't contain type-specific logic.
   ui::wm::WindowType type() const { return type_; }
   void SetType(ui::wm::WindowType type);
 
   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_; }
   void SetTransparent(bool transparent);
 
   // See description in Layer::SetFillsBoundsCompletely.
   void SetFillsBoundsCompletely(bool fills_bounds);
 
   WindowDelegate* delegate() { return delegate_; }
   const WindowDelegate* delegate() const { return delegate_; }
@@ skipping 373 matching lines @@
 
   // Child windows. Topmost is last.
   Windows children_;
 
   // The visibility state of the window as set by Show()/Hide(). This may differ
   // from the visibility of the underlying layer, which may remain visible after
   // the window is hidden (e.g. to animate its disappearance).
   bool visible_;
 
   int id_;
-  std::string name_;
-
-  base::string16 title_;
 
   // Whether layer is initialized as non-opaque.
   bool transparent_;
 
   std::unique_ptr<LayoutManager> layout_manager_;
   std::unique_ptr<ui::EventTargeter> targeter_;
 
   void* user_data_;
 
   // Makes the window pass all events through to any windows behind it.
@@ skipping 14 matching lines @@
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_H_