Rework FocusManager as FocusClient.

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 <map>
 #include <string>
 #include <vector>
@@ skipping 22 matching lines @@
 }
 
 namespace ui {
 class EventHandler;
 class Layer;
 class Texture;
 }
 
 namespace aura {
 
-class FocusManager;
 class LayoutManager;
 class RootWindow;
 class WindowDelegate;
 class WindowObserver;
 
 // Defined in window_property.h (which we do not include)
 template<typename T>
 struct WindowProperty;
 
 // Aura window implementation. Interesting events are sent to the
@@ skipping 246 matching lines @@
 
   // Returns true if the Window is currently the focused window.
   bool HasFocus() const;
 
   // Returns true if the Window can be focused.
   virtual bool CanFocus() const;
 
   // Returns true if the Window can receive events.
   virtual bool CanReceiveEvents() const;
 
-  // Returns the FocusManager for the Window, which may be attached to a parent
-  // Window. Can return NULL if the Window has no FocusManager.
-  virtual FocusManager* GetFocusManager();
-  virtual const FocusManager* GetFocusManager() const;
-
   // Does a capture on the window. This does nothing if the window isn't showing
   // (VISIBILITY_SHOWN) or isn't contained in a valid window hierarchy.
   void SetCapture();
 
   // Releases a capture.
   void ReleaseCapture();
 
   // Returns true if this window has capture.
   bool HasCapture();
 
@@ skipping 175 matching lines @@
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_H_