ui: Cleanup class/struct forward declarations

ui/aura/window.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_AURA_WINDOW_H_
 #define UI_AURA_WINDOW_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 19 matching lines @@
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/wm/public/window_types.h"
 
 namespace display {
 class Display;
 }
 
 namespace gfx {
 class Transform;
-class Vector2d;
 }
 
 namespace ui {
-class EventHandler;
 class Layer;
-class TextInputClient;
-class Texture;
 }
 
 namespace aura {
 
 class LayoutManager;
 class WindowDelegate;
 class WindowPort;
 class WindowObserver;
 class WindowTreeHost;
 
@@ skipping 475 matching lines @@
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_H_