Makes native_widget_types forward declare ui::Cursor.

ui/views/widget/root_view.cc

 // 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.
 
 #include "ui/views/widget/root_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/events/event.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/focus/view_storage.h"
 #include "ui/views/layout/fill_layout.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/widget/widget_deletion_observer.h"
 
+#if defined(USE_AURA)
+#include "ui/base/cursor/cursor.h"
+#endif
+
 namespace views {
 namespace internal {
 
 namespace {
 
 enum EventType {
   EVENT_ENTER,
   EVENT_EXIT
 };
 
@@ skipping 677 matching lines @@
       return;
   }
 }
 
 bool RootView::CanDispatchToTarget(ui::EventTarget* target) {
   return event_dispatch_target_ == target;
 }
 
 }  // namespace internal
 }  // namespace views