Remove ash::ScopedObserverWithDuplicatedSources

ash/shelf/shelf_window_watcher.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 ASH_SHELF_SHELF_WINDOW_WATCHER_H_
 #define ASH_SHELF_SHELF_WINDOW_WATCHER_H_
 
 #include <stdint.h>
 
-#include "ash/shelf/scoped_observer_with_duplicated_sources.h"
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/scoped_observer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/display/display_observer.h"
 #include "ui/wm/public/activation_change_observer.h"
 
 namespace aura {
 
 class Window;
 
@@ skipping 110 matching lines @@
 
   // Holds all observed windows.
   ScopedObserver<aura::Window, aura::WindowObserver> observed_windows_;
 
   // Holds all observed root windows.
   ScopedObserver<aura::Window, aura::WindowObserver> observed_root_windows_;
 
   // Holds removed windows that has an item from default container.
   ScopedObserver<aura::Window, aura::WindowObserver> observed_removed_windows_;
 
-  // Holds all observed activation clients.
-  ScopedObserverWithDuplicatedSources<aura::client::ActivationClient,
-                                      aura::client::ActivationChangeObserver>
-      observed_activation_clients_;
-
   DISALLOW_COPY_AND_ASSIGN(ShelfWindowWatcher);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_WINDOW_WATCHER_H_