Clean up forward declarations in Source/core/html

Source/core/html/HTMLFormElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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 HTMLFormElement_h
 #define HTMLFormElement_h
 
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLFormControlElement.h"
 #include "core/html/forms/RadioButtonGroupScope.h"
 #include "core/loader/FormSubmission.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/WeakPtr.h"
 
-namespace WTF{
-class TextEncoding;
-}
-
 namespace blink {
 
 class Event;
 class FormAssociatedElement;
-class FormData;
 class GenericEventQueue;
 class HTMLFormControlElement;
 class HTMLFormControlsCollection;
 class HTMLImageElement;
-class HTMLInputElement;
 
 class HTMLFormElement FINAL : public HTMLElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<HTMLFormElement> create(Document&);
     virtual ~HTMLFormElement();
     virtual void trace(Visitor*) OVERRIDE;
 
     PassRefPtrWillBeRawPtr<HTMLFormControlsCollection> elements();
     void getNamedElements(const AtomicString&, WillBeHeapVector<RefPtrWillBeMember<Element> >&);
@@ skipping 127 matching lines @@
     bool m_isInResetFunction : 1;
 
     bool m_wasDemoted : 1;
 
     OwnPtrWillBeMember<GenericEventQueue> m_pendingAutocompleteEventsQueue;
 };
 
 } // namespace blink
 
 #endif // HTMLFormElement_h