Remove some unused includes from core/css and core/dom

Source/core/dom/shadow/ContentSelectorQuery.cpp

 /*
  * Copyright (C) 2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 13 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/shadow/ContentSelectorQuery.h"
 
 #include "core/css/CSSSelectorList.h"
 #include "core/css/SelectorChecker.h"
 #include "core/css/SiblingTraversalStrategies.h"
 #include "core/dom/shadow/InsertionPoint.h"
-#include "core/dom/shadow/ShadowRoot.h"
 
 namespace WebCore {
 
 bool ContentSelectorDataList::checkContentSelector(const CSSSelector* selector, const Vector<RefPtr<Node> >& siblings, int nth)
 {
     Element* element = toElement(siblings[nth].get());
     SelectorChecker selectorChecker(element->document(), SelectorChecker::CollectingRules);
     SelectorChecker::SelectorCheckingContext context(selector, element, SelectorChecker::VisitedMatchEnabled);
     ShadowDOMSiblingTraversalStrategy strategy(siblings, nth);
     PseudoId ignoreDynamicPseudo = NOPSEUDO;
@@ skipping 34 matching lines @@
         return false;
     case InsertionPoint::HasToMatchSelector:
         return node->isElementNode() && m_selectors.matches(siblings, nth);
     default:
         ASSERT_NOT_REACHED();
         return false;
     }
 }
 
 }