include RefCounted.h where needed, only.

third_party/WebKit/Source/core/workers/AbstractWorker.h

 /*
  * Copyright (C) 2010 Google Inc. 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.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef AbstractWorker_h
 #define AbstractWorker_h
 
 #include "core/CoreExport.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/events/EventListener.h"
 #include "core/events/EventTarget.h"
 #include "platform/heap/Handle.h"
-#include "wtf/RefCounted.h"
-#include "wtf/text/AtomicStringHash.h"
+#include "wtf/Forward.h"
 
 namespace blink {
 
 class ExceptionState;
 class KURL;
 class ExecutionContext;
 
 class CORE_EXPORT AbstractWorker : public EventTargetWithInlineData, public ActiveDOMObject {
     USING_GARBAGE_COLLECTED_MIXIN(AbstractWorker);
 public:
     // EventTarget APIs
     ExecutionContext* getExecutionContext() const final { return ActiveDOMObject::getExecutionContext(); }
 
     DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(error);
 
     AbstractWorker(ExecutionContext*);
     ~AbstractWorker() override;
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
     // Helper function that converts a URL to an absolute URL and checks the result for validity.
     KURL resolveURL(const String& url, ExceptionState&);
 };
 
 } // namespace blink
 
 #endif // AbstractWorker_h