blink: Cleanup class/struct forward declarations

third_party/WebKit/Source/web/WebPluginContainerImpl.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 24 matching lines @@
 #include "core/frame/DOMWindowProperty.h"
 #include "core/plugins/PluginView.h"
 #include "platform/Widget.h"
 #include "public/web/WebPluginContainer.h"
 #include "web/WebExport.h"
 #include "wtf/Compiler.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
-struct NPObject;
-
 namespace blink {
 
 class GestureEvent;
 class HTMLFrameOwnerElement;
 class HTMLPlugInElement;
 class IntRect;
 class KeyboardEvent;
 class MouseEvent;
 class ResourceError;
 class ResourceResponse;
@@ skipping 174 matching lines @@
 // WebPluginContainerImpl is the only subclass of WebPluginContainer.
 DEFINE_TYPE_CASTS(WebPluginContainerImpl,
                   WebPluginContainer,
                   container,
                   true,
                   true);
 
 }  // namespace blink
 
 #endif