Minor cleanups to includes and fwd decls in core/css/resolver

Source/core/css/resolver/ScopedStyleResolver.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.
  * Copyright (C) 2012 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 11 matching lines @@
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ScopedStyleResolver_h
 #define ScopedStyleResolver_h
 
 #include "core/css/CSSKeyframesRule.h"
 #include "core/css/RuleSet.h"
-#include "core/css/SiblingTraversalStrategies.h"
+#include "core/dom/ContainerNode.h"
+#include "core/dom/Element.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
+#include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
-class ContainerNode;
 class ElementRuleCollector;
 class MediaQueryEvaluator;
 class PageRuleCollector;
-class ScopedStyleResolver;
 class ShadowRoot;
 class StyleSheetContents;
 
 // This class selects a RenderStyle for a given element based on a collection of stylesheets.
 class ScopedStyleResolver {
     WTF_MAKE_NONCOPYABLE(ScopedStyleResolver); WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<ScopedStyleResolver> create(const ContainerNode* scopingNode) { return adoptPtr(new ScopedStyleResolver(scopingNode)); }
 
     static const ContainerNode* scopingNodeFor(const CSSStyleSheet*);
@@ skipping 96 matching lines @@
 {
     if (!cacheIsValid(element))
         resolveStyleCache(element);
 
     return m_cache.scopedResolver;
 }
 
 } // namespace WebCore
 
 #endif // ScopedStyleResolver_h