blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/plugins/PluginView.h

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2013 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:
  * 1.  Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 22 matching lines @@
 #include "platform/scroll/ScrollTypes.h"
 #include "wtf/text/WTFString.h"
 #include <v8.h>
 
 namespace blink {
 class WebLayer;
 }
 
 namespace blink {
 
-class ResourceError;
 class ResourceResponse;
 
 class CORE_EXPORT PluginView : public Widget {
  public:
   bool isPluginView() const final { return true; }
 
   virtual WebLayer* platformLayer() const { return 0; }
   virtual v8::Local<v8::Object> scriptableObject(v8::Isolate*) {
     return v8::Local<v8::Object>();
   }
@@ skipping 14 matching lines @@
 
 DEFINE_TYPE_CASTS(PluginView,
                   Widget,
                   widget,
                   widget->isPluginView(),
                   widget.isPluginView());
 
 }  // namespace blink
 
 #endif  // PluginView_h