Change shadow style's scope from Shadow Host to Shadow Root

Source/core/css/TreeBoundaryCrossingRules.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 61 matching lines @@
     CascadeOrder outerCascadeOrder = size() + size();
     // When comparing rules declared in inner treescopes, inner's rules win.
     CascadeOrder innerCascadeOrder = size();
 
     for (DocumentOrderedList::iterator it = m_scopingNodes.begin(); it != m_scopingNodes.end(); ++it) {
         const ContainerNode* scopingNode = toContainerNode(*it);
         CSSStyleSheetRuleSubSet* ruleSubSet = m_treeBoundaryCrossingRuleSetMap.get(scopingNode);
         unsigned boundaryBehavior = SelectorChecker::ScopeContainsLastMatchedElement;
         bool isInnerTreeScope = element->treeScope().isInclusiveAncestorOf(scopingNode->treeScope());
 
-        // If a given scoping node is a shadow root,
-        // we should use ScopeIsShadowHost.
-        if (scopingNode && scopingNode->isShadowRoot()) {
-            boundaryBehavior |= SelectorChecker::ScopeIsShadowHost;
-            scopingNode = toShadowRoot(scopingNode)->host();
-        }
+        // If a given scoping node is a shadow root, we should use ScopeIsShadowRoot.
+        if (scopingNode && scopingNode->isShadowRoot())
+            boundaryBehavior |= SelectorChecker::ScopeIsShadowRoot;
 
         CascadeOrder cascadeOrder = isInnerTreeScope ? innerCascadeOrder : outerCascadeOrder;
         for (CSSStyleSheetRuleSubSet::iterator it = ruleSubSet->begin(); it != ruleSubSet->end(); ++it) {
             CSSStyleSheet* parentStyleSheet = it->first;
             RuleSet* ruleSet = it->second.get();
             collector.collectMatchingRules(MatchRequest(ruleSet, includeEmptyRules, scopingNode, parentStyleSheet), ruleRange, static_cast<SelectorChecker::BehaviorAtBoundary>(boundaryBehavior), ignoreCascadeScope, cascadeOrder);
         }
         ++innerCascadeOrder;
         --outerCascadeOrder;
     }
@@ skipping 11 matching lines @@
         features.add(it->second->features());
 }
 
 void TreeBoundaryCrossingRules::collectFeaturesTo(RuleFeatureSet& features)
 {
     for (TreeBoundaryCrossingRuleSetMap::iterator::Values it = m_treeBoundaryCrossingRuleSetMap.values().begin(); it != m_treeBoundaryCrossingRuleSetMap.values().end(); ++it)
         collectFeaturesFromRuleSubSet(it->get(), features);
 }
 
 } // namespace WebCore