Remove unused Dictionary forward declaration and include

Source/core/dom/Element.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003-2011, 2013, 2014 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
@@ skipping 30 matching lines @@
 
 class ActiveAnimations;
 class Attr;
 class Attribute;
 class CSSStyleDeclaration;
 class ClientRect;
 class ClientRectList;
 class CustomElementDefinition;
 class DOMStringMap;
 class DOMTokenList;
+class Dictionary;
 class Document;
 class ElementRareData;
 class ElementShadow;
 class ExceptionState;
 class Image;
 class InputMethodContext;
 class IntSize;
 class Locale;
 class MutableStylePropertySet;
 class PropertySetCSSStyleDeclaration;
@@ skipping 801 matching lines @@
     static PassRefPtrWillBeRawPtr<T> create(const QualifiedName&, Document&)
 #define DEFINE_ELEMENT_FACTORY_WITH_TAGNAME(T) \
     PassRefPtrWillBeRawPtr<T> T::create(const QualifiedName& tagName, Document& document) \
     { \
         return adoptRefWillBeNoop(new T(tagName, document)); \
     }
 
 } // namespace
 
 #endif // Element_h