Unify window fullscreen and minimizing implementation

ui/views/widget/native_widget_aura.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_WIDGET_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 200 matching lines @@
   aura::Window* window_;
 
   // See class documentation for Widget in widget.h for a note about ownership.
   Widget::InitParams::Ownership ownership_;
 
   // Are we in the destructor?
   bool destroying_;
 
   gfx::NativeCursor cursor_;
 
-  // The saved window state for exiting full screen state.
-  ui::WindowShowState saved_window_state_;
-
   std::unique_ptr<TooltipManagerAura> tooltip_manager_;
 
   // Reorders child windows of |window_| associated with a view based on the
   // order of the associated views in the widget's view hierarchy.
   std::unique_ptr<WindowReorderer> window_reorderer_;
 
   std::unique_ptr<DropHelper> drop_helper_;
   int last_drop_operation_;
 
   // Native widget's handler to receive events before the event target.
   std::unique_ptr<FocusManagerEventHandler> focus_manager_event_handler_;
 
   // The following factory is used for calls to close the NativeWidgetAura
   // instance.
   base::WeakPtrFactory<NativeWidgetAura> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_