Converts overview to use common ash types

ash/wm/overview/window_selector_controller.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_WM_OVERVIEW_WINDOW_SELECTOR_CONTROLLER_H_
 #define ASH_WM_OVERVIEW_WINDOW_SELECTOR_CONTROLLER_H_
 
 #include <list>
 #include <memory>
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "ash/wm/overview/window_selector.h"
 #include "ash/wm/overview/window_selector_delegate.h"
 #include "base/macros.h"
 #include "base/time/time.h"
-#include "ui/aura/window_observer.h"
-
-namespace aura {
-class Window;
-}
 
 namespace ash {
 class WindowSelector;
 class WindowSelectorTest;
 
 // Manages a window selector which displays an overview of all windows and
 // allows selecting a window to activate it.
 class ASH_EXPORT WindowSelectorController
     : public WindowSelectorDelegate {
  public:
@@ skipping 27 matching lines @@
 
   std::unique_ptr<WindowSelector> window_selector_;
   base::Time last_selection_time_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowSelectorController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_OVERVIEW_WINDOW_SELECTOR_CONTROLLER_H_