Clean up forward declarations in Source/core/loader

Source/core/loader/DocumentWriter.h

 /*
  * Copyright (C) 2010. Adam Barth. 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 20 matching lines @@
 
 #include "core/loader/TextResourceDecoderBuilder.h"
 #include "platform/heap/Handle.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class Document;
 class DocumentParser;
-class LocalFrame;
-class KURL;
-class SecurityOrigin;
-class TextResourceDecoder;
 
 class DocumentWriter : public RefCountedWillBeGarbageCollectedFinalized<DocumentWriter> {
     WTF_MAKE_NONCOPYABLE(DocumentWriter);
 public:
     static PassRefPtrWillBeRawPtr<DocumentWriter> create(Document*, const AtomicString& mimeType = emptyAtom, const AtomicString& encoding = emptyAtom);
 
     ~DocumentWriter();
     void trace(Visitor*);
 
     void end();
@@ skipping 19 matching lines @@
 
     RawPtrWillBeMember<Document> m_document;
     TextResourceDecoderBuilder m_decoderBuilder;
 
     RefPtrWillBeMember<DocumentParser> m_parser;
 };
 
 } // namespace blink
 
 #endif // DocumentWriter_h