Clean up forward declarations in Source/core/css

Source/core/css/resolver/SharedStyleFinder.h

 /*
  * Copyright (C) 2013 Google, Inc.
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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 10 matching lines @@
 
 #ifndef SharedStyleFinder_h
 #define SharedStyleFinder_h
 
 #include "core/css/resolver/ElementResolveContext.h"
 #include "core/dom/Element.h"
 
 namespace blink {
 
 class Element;
-class Node;
 class RenderStyle;
 class RuleFeatureSet;
 class RuleSet;
 class SpaceSplitString;
 class StyleResolver;
 
 class SharedStyleFinder {
     STACK_ALLOCATED();
 public:
     // RuleSets are passed non-const as the act of matching against them can cause them
@@ skipping 33 matching lines @@
     const RuleFeatureSet& m_features;
     RawPtrWillBeMember<RuleSet> m_siblingRuleSet;
     RawPtrWillBeMember<RuleSet> m_uncommonAttributeRuleSet;
     StyleResolver& m_styleResolver;
     const ElementResolveContext& m_context;
 };
 
 } // namespace blink
 
 #endif // SharedStyleFinder_h