Clean up forward declarations in Source/core/fetch and /loader

Source/core/fetch/XSLStyleSheetResource.h

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 13 matching lines @@
 */
 
 #ifndef XSLStyleSheetResource_h
 #define XSLStyleSheetResource_h
 
 #include "core/fetch/ResourcePtr.h"
 #include "core/fetch/StyleSheetResource.h"
 
 namespace blink {
 
-class ResourceFetcher;
-class TextResourceDecoder;
-
 class XSLStyleSheetResource FINAL : public StyleSheetResource {
 public:
     XSLStyleSheetResource(const ResourceRequest&, const String& charset);
 
     const String& sheet() const { return m_sheet; }
 
     virtual void didAddClient(ResourceClient*) OVERRIDE;
 
 protected:
     virtual void checkNotify() OVERRIDE;
 
     String m_sheet;
 };
 
 DEFINE_RESOURCE_TYPE_CASTS(XSLStyleSheet);
 
 } // namespace blink
 
 #endif