chromeos: converts ash devtools to aura::Window

ui/wm/core/default_activation_client.h

 // Copyright 2013 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_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_
 #define UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 21 matching lines @@
                                           public aura::WindowObserver {
  public:
   explicit DefaultActivationClient(aura::Window* root_window);
 
   // Overridden from aura::client::ActivationClient:
   void AddObserver(aura::client::ActivationChangeObserver* observer) override;
   void RemoveObserver(
       aura::client::ActivationChangeObserver* observer) override;
   void ActivateWindow(aura::Window* window) override;
   void DeactivateWindow(aura::Window* window) override;
-  aura::Window* GetActiveWindow() override;
+  const aura::Window* GetActiveWindow() const override;
   aura::Window* GetActivatableWindow(aura::Window* window) override;
   aura::Window* GetToplevelWindow(aura::Window* window) override;
   bool CanActivateWindow(aura::Window* window) const override;
 
   // Overridden from WindowObserver:
   void OnWindowDestroyed(aura::Window* window) override;
 
  private:
   class Deleter;
 
@@ skipping 14 matching lines @@
   aura::Window* last_active_;
 
   base::ObserverList<aura::client::ActivationChangeObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultActivationClient);
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_DEFAULT_ACTIVATION_CLIENT_H_