Makes native_widget_types forward declare ui::Cursor.

ui/views/widget/desktop_aura/desktop_drag_drop_client_aurax11.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_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_
 
 #include <X11/Xlib.h>
 
 // Get rid of a macro from Xlib.h that conflicts with Aura's RootWindow class.
 #undef RootWindow
 
 #include <set>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/window_observer.h"
+#include "ui/base/cursor/cursor.h"
 #include "ui/base/x/x11_atom_cache.h"
 #include "ui/gfx/point.h"
 #include "ui/views/views_export.h"
 #include "ui/views/widget/desktop_aura/x11_whole_screen_move_loop.h"
 #include "ui/views/widget/desktop_aura/x11_whole_screen_move_loop_delegate.h"
 
 namespace aura {
 class RootWindow;
 namespace client {
 class DragDropDelegate;
@@ skipping 191 matching lines @@
   gfx::NativeCursor move_grab_cursor_;
 
   static std::map< ::Window, DesktopDragDropClientAuraX11*> g_live_client_map;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopDragDropClientAuraX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_DRAG_DROP_CLIENT_AURAX11_H_