Clean up forward declarations in Source/core/loader

Source/core/loader/DocumentLoader.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2011 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 30 matching lines @@
 #include "platform/network/ResourceError.h"
 #include "platform/network/ResourceRequest.h"
 #include "platform/network/ResourceResponse.h"
 #include "wtf/HashSet.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 class WebThreadedDataReceiver;
 }
 
-namespace WTF {
-class SchedulePair;
-}
-
 namespace blink {
     class ApplicationCacheHost;
-    class ArchiveResource;
     class ArchiveResourceCollection;
     class ResourceFetcher;
-    class ContentFilter;
     class DocumentInit;
-    class FormState;
     class LocalFrame;
     class FrameLoader;
     class MHTMLArchive;
-    class Page;
     class ResourceLoader;
-    class SharedBuffer;
 
     class DocumentLoader : public RefCounted<DocumentLoader>, private RawResourceClient {
         WTF_MAKE_FAST_ALLOCATED;
     public:
         static PassRefPtr<DocumentLoader> create(LocalFrame* frame, const ResourceRequest& request, const SubstituteData& data)
         {
             return adoptRef(new DocumentLoader(frame, request, data));
         }
         virtual ~DocumentLoader();
 
@@ skipping 144 matching lines @@
         double m_timeOfLastDataReceived;
 
         friend class ApplicationCacheHost;  // for substitute resource delivery
         OwnPtrWillBePersistent<ApplicationCacheHost> m_applicationCacheHost;
 
         RefPtr<ContentSecurityPolicy> m_contentSecurityPolicy;
     };
 }
 
 #endif // DocumentLoader_h