Make aura::clients take Window instead of RootWindow

ui/aura/client/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_AURA_CLIENT_DEFAULT_ACTIVATION_CLIENT_H_
 #define UI_AURA_CLIENT_DEFAULT_ACTIVATION_CLIENT_H_
 
+#include <vector>
+
 #include "base/compiler_specific.h"
 #include "base/logging.h"
+#include "base/observer_list.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/window_observer.h"
 
 namespace aura {
-class RootWindow;
 namespace client {
 class ActivationChangeObserver;
 }
 
 namespace client {
 
 // Simple ActivationClient implementation for use by tests and other targets
 // that just need basic behavior (e.g. activate windows whenever requested,
 // restack windows at the top when they're activated, etc.).
 class AURA_EXPORT DefaultActivationClient : public client::ActivationClient,
                                             public WindowObserver {
  public:
-  explicit DefaultActivationClient(RootWindow* root_window);
+  explicit DefaultActivationClient(Window* root_window);
   virtual ~DefaultActivationClient();
 
   // Overridden from client::ActivationClient:
   virtual void AddObserver(client::ActivationChangeObserver* observer) OVERRIDE;
   virtual void RemoveObserver(
       client::ActivationChangeObserver* observer) OVERRIDE;
   virtual void ActivateWindow(Window* window) OVERRIDE;
   virtual void DeactivateWindow(Window* window) OVERRIDE;
   virtual Window* GetActiveWindow() OVERRIDE;
   virtual Window* GetActivatableWindow(Window* window) OVERRIDE;
@@ skipping 19 matching lines @@
 
   ObserverList<client::ActivationChangeObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultActivationClient);
 };
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_DEFAULT_ACTIVATION_CLIENT_H_