Attempt to re-land FocusManager removal from Aura.

ui/views/corewm/focus_controller.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_VIEWS_COREWM_FOCUS_CONTROLLER_H_
 #define UI_VIEWS_COREWM_FOCUS_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/scoped_observer.h"
 #include "ui/aura/client/activation_client.h"
@@ skipping 46 matching lines @@
   virtual bool CanActivateWindow(aura::Window* window) const OVERRIDE;
 
   // Overridden from aura::client::FocusClient:
   virtual void AddObserver(
       aura::client::FocusChangeObserver* observer) OVERRIDE;
   virtual void RemoveObserver(
       aura::client::FocusChangeObserver* observer) OVERRIDE;
   virtual void FocusWindow(aura::Window* window) OVERRIDE;
   virtual void ResetFocusWithinActiveWindow(aura::Window* window) OVERRIDE;
   virtual aura::Window* GetFocusedWindow() OVERRIDE;
-  virtual void OnWindowHiddenInRootWindow(aura::Window* window,
-                                          aura::RootWindow* root_window,
-                                          bool destroyed) OVERRIDE;
 
   // Overridden from ui::EventHandler:
   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
   virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // Overridden from aura::WindowObserver:
   virtual void OnWindowVisibilityChanged(aura::Window* window,
@@ skipping 41 matching lines @@
 
   ScopedObserver<aura::Window, aura::WindowObserver> observer_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(FocusController);
 };
 
 }  // namespace corewm
 }  // namespace views
 
 #endif  // UI_VIEWS_COREWM_FOCUS_CONTROLLER_H_