Make style independent of the presence of the <shadow> element.

Source/core/css/resolver/StyleResolver.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, 2013 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 395 matching lines @@
 
     RuleRange ruleRange = collector.matchedResult().ranges.authorRuleRange();
 
     // When comparing rules declared in outer treescopes, outer's rules win.
     CascadeOrder outerCascadeOrder = m_treeBoundaryCrossingRules.size() + m_treeBoundaryCrossingRules.size();
     // When comparing rules declared in inner treescopes, inner's rules win.
     CascadeOrder innerCascadeOrder = m_treeBoundaryCrossingRules.size();
 
     for (DocumentOrderedList::iterator it = m_treeBoundaryCrossingRules.begin(); it != m_treeBoundaryCrossingRules.end(); ++it) {
         const ContainerNode* scopingNode = toContainerNode(*it);
-
-        if (ShadowRoot* shadowRoot = scopingNode->containingShadowRoot()) {
-            if (!shadowRoot->isActiveForStyling())
-                continue;
-        }
-
         RuleSet* ruleSet = m_treeBoundaryCrossingRules.ruleSetScopedBy(scopingNode);
         unsigned boundaryBehavior = SelectorChecker::ScopeContainsLastMatchedElement;
         bool isInnerTreeScope = element->treeScope().isInclusiveAncestorOf(scopingNode->treeScope());
 
         // If a given scoping node is a shadow root and a given element is in a descendant tree of tree hosted by
         // the scoping node's shadow host, we should use ScopeIsShadowHost.
         if (scopingNode && scopingNode->isShadowRoot()) {
             if (element->isInDescendantTreeOf(toShadowRoot(scopingNode)->host()))
                 boundaryBehavior |= SelectorChecker::ScopeIsShadowHost;
             scopingNode = toShadowRoot(scopingNode)->host();
@@ skipping 997 matching lines @@
     visitor->trace(m_keyframesRuleMap);
     visitor->trace(m_viewportDependentMediaQueryResults);
     visitor->trace(m_viewportStyleResolver);
     visitor->trace(m_siblingRuleSet);
     visitor->trace(m_uncommonAttributeRuleSet);
     visitor->trace(m_watchedSelectorsRules);
     visitor->trace(m_treeBoundaryCrossingRules);
 }
 
 } // namespace WebCore