Cleanup: Remove unneeded forward declarations in views.

views/controls/menu/menu_host.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_CONTROLS_MENU_MENU_HOST_H_
 #define VIEWS_CONTROLS_MENU_MENU_HOST_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "ui/gfx/rect.h"
 #include "views/controls/menu/native_menu_host_delegate.h"
 #include "views/widget/widget.h"
 
 namespace views {
 
-class NativeMenuHost;
 class NativeWidget;
 class SubmenuView;
 class View;
 class Widget;
 
 // SubmenuView uses a MenuHost to house the SubmenuView.
 //
 // SubmenuView owns the MenuHost. When SubmenuView is done with the MenuHost
 // |DestroyMenuHost| is invoked. The one exception to this is if the native
 // OS destroys the widget out from under us, in which case |MenuHostDestroyed|
@@ skipping 44 matching lines @@
 
   // If true and capture is lost we don't notify the delegate.
   bool ignore_capture_lost_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuHost);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_MENU_MENU_HOST_H_