views: Forward declare "class View;" in layout_manager.h

views/widget/widget_win.h

 // Copyright (c) 2011 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 VIEWS_WIDGET_WIDGET_WIN_H_
 #define VIEWS_WIDGET_WIDGET_WIN_H_
 #pragma once
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
 #include <atlmisc.h>
 
 #include <string>
 #include <vector>
 
 #include "base/message_loop.h"
+#include "base/scoped_ptr.h"
 #include "base/scoped_vector.h"
 #include "base/win/scoped_comptr.h"
 #include "ui/base/win/window_impl.h"
 #include "views/focus/focus_manager.h"
 #include "views/layout/layout_manager.h"
 #include "views/widget/widget.h"
 
 namespace ui {
 class ViewProp;
 }
@@ skipping 565 matching lines @@
   int accessibility_view_events_index_;
 
   ViewProps props_;
 
   DISALLOW_COPY_AND_ASSIGN(WidgetWin);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_WIDGET_WIN_H_