Cleanup: Remove unneeded forward declarations in views.

views/desktop/desktop_window_view.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_DESKTOP_DESKTOP_WINDOW_VIEW_H_
 #define VIEWS_DESKTOP_DESKTOP_WINDOW_VIEW_H_
 
 #include "base/observer_list.h"
 #include "ui/gfx/compositor/layer_animation_observer.h"
 #include "views/view.h"
 #include "views/widget/widget_delegate.h"
 
 namespace ui {
 class LayerAnimationSequence;
 }  // namespace ui
 
 namespace views {
-class NativeWidgetViews;
+
 class Widget;
 
 namespace desktop {
 
 class DesktopWindowView : public WidgetDelegateView,
                           public ui::LayerAnimationObserver {
  public:
   // Observers can listen to various events on the desktop.
   class Observer {
    public:
@@ skipping 62 matching lines @@
   DesktopType type_;
   Widget* widget_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopWindowView);
 };
 
 }  // namespace desktop
 }  // namespace views
 
 #endif  // VIEWS_DESKTOP_DESKTOP_WINDOW_VIEW_H_