blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/css/RuleFeature.h

 /*
  * 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 18 matching lines @@
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/HashSet.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace blink {
 
 struct InvalidationLists;
 class QualifiedName;
 class RuleData;
-class SpaceSplitString;
 class StyleRule;
 
 struct RuleFeature {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 
  public:
   RuleFeature(StyleRule*,
               unsigned selectorIndex,
               bool hasDocumentSecurityOrigin);
 
@@ skipping 227 matching lines @@
 
   // If true, the RuleFeatureSet is alive and can be used.
   unsigned m_isAlive : 1;
 
   friend class RuleFeatureSetTest;
 };
 
 }  // namespace blink
 
 #endif  // RuleFeature_h